build(deps): bump httpx from 0.27.2 to 0.28.0 (#513)

Bumps [httpx](https://github.com/encode/httpx) from 0.27.2 to 0.28.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/encode/httpx/releases">httpx's
releases</a>.</em></p>
<blockquote>
<h2>Version 0.28.0</h2>
<h2>0.28.0 (28th November, 2024)</h2>
<p>The 0.28 release includes a limited set of deprecations.</p>
<p><strong>Deprecations</strong>:</p>
<p>We are working towards a simplified SSL configuration API.</p>
<p><em>For users of the standard <code>verify=True</code> or
<code>verify=False</code> cases, or
<code>verify=&lt;ssl_context&gt;</code> case this should require no
changes. The following cases have been deprecated...</em></p>
<ul>
<li>The <code>verify</code> argument as a string argument is now
deprecated and will raise warnings.</li>
<li>The <code>cert</code> argument is now deprecated and will raise
warnings.</li>
</ul>
<p>Our revised <a
href="https://github.com/encode/httpx/blob/HEAD/docs/advanced/ssl.md">SSL
documentation</a> covers how to implement the same behaviour with a more
constrained API.</p>
<p><strong>The following changes are also included</strong>:</p>
<ul>
<li>The deprecated <code>proxies</code> argument has now been
removed.</li>
<li>The deprecated <code>app</code> argument has now been removed.</li>
<li>JSON request bodies use a compact representation. (<a
href="https://redirect.github.com/encode/httpx/issues/3363">#3363</a>)</li>
<li>Review URL percent escape sets, based on WHATWG spec. (<a
href="https://redirect.github.com/encode/httpx/issues/3371">#3371</a>,
<a
href="https://redirect.github.com/encode/httpx/issues/3373">#3373</a>)</li>
<li>Ensure <code>certifi</code> and <code>httpcore</code> are only
imported if required. (<a
href="https://redirect.github.com/encode/httpx/issues/3377">#3377</a>)</li>
<li>Treat <code>socks5h</code> as a valid proxy scheme. (<a
href="https://redirect.github.com/encode/httpx/issues/3178">#3178</a>)</li>
<li>Cleanup <code>Request()</code> method signature in line with
<code>client.request()</code> and <code>httpx.request()</code>. (<a
href="https://redirect.github.com/encode/httpx/issues/3378">#3378</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/encode/httpx/blob/master/CHANGELOG.md">httpx's
changelog</a>.</em></p>
<blockquote>
<h2>0.28.0 (28th November, 2024)</h2>
<p>The 0.28 release includes a limited set of deprecations.</p>
<p><strong>Deprecations</strong>:</p>
<p>We are working towards a simplified SSL configuration API.</p>
<p><em>For users of the standard <code>verify=True</code> or
<code>verify=False</code> cases, or
<code>verify=&lt;ssl_context&gt;</code> case this should require no
changes. The following cases have been deprecated...</em></p>
<ul>
<li>The <code>verify</code> argument as a string argument is now
deprecated and will raise warnings.</li>
<li>The <code>cert</code> argument is now deprecated and will raise
warnings.</li>
</ul>
<p>Our revised <a
href="https://github.com/encode/httpx/blob/master/docs/advanced/ssl.md">SSL
documentation</a> covers how to implement the same behaviour with a more
constrained API.</p>
<p><strong>The following changes are also included</strong>:</p>
<ul>
<li>The deprecated <code>proxies</code> argument has now been
removed.</li>
<li>The deprecated <code>app</code> argument has now been removed.</li>
<li>JSON request bodies use a compact representation. (<a
href="https://redirect.github.com/encode/httpx/issues/3363">#3363</a>)</li>
<li>Review URL percent escape sets, based on WHATWG spec. (<a
href="https://redirect.github.com/encode/httpx/issues/3371">#3371</a>,
<a
href="https://redirect.github.com/encode/httpx/issues/3373">#3373</a>)</li>
<li>Ensure <code>certifi</code> and <code>httpcore</code> are only
imported if required. (<a
href="https://redirect.github.com/encode/httpx/issues/3377">#3377</a>)</li>
<li>Treat <code>socks5h</code> as a valid proxy scheme. (<a
href="https://redirect.github.com/encode/httpx/issues/3178">#3178</a>)</li>
<li>Cleanup <code>Request()</code> method signature in line with
<code>client.request()</code> and <code>httpx.request()</code>. (<a
href="https://redirect.github.com/encode/httpx/issues/3378">#3378</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/encode/httpx/commit/80960fa31918d7663c3f4c3ad61661cf0e80628f"><code>80960fa</code></a>
Version 0.28.0. (<a
href="https://redirect.github.com/encode/httpx/issues/3419">#3419</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/a33c87852b8a0dddc65e5f739af1e0a6fca4b91f"><code>a33c878</code></a>
Fix <code>extensions</code> type annotation. (<a
href="https://redirect.github.com/encode/httpx/issues/3380">#3380</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/ce7e14da27abba6574be9b3ea7cd5990556a9343"><code>ce7e14d</code></a>
Error on verify as str. (<a
href="https://redirect.github.com/encode/httpx/issues/3418">#3418</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/47f4a96ffaaaa07dca1614409549b5d7a6e7af49"><code>47f4a96</code></a>
Handle empty zstd responses (<a
href="https://redirect.github.com/encode/httpx/issues/3412">#3412</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/189fc4bcbe5f314128775dec66a616ac9a31ad48"><code>189fc4b</code></a>
Update CHANGELOG.md, fix typo(s) (<a
href="https://redirect.github.com/encode/httpx/issues/3406">#3406</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/7b19cd5f4b749064c6452892a5e58a3758da1d1b"><code>7b19cd5</code></a>
Move utility functions from _utils.py to _client.py (<a
href="https://redirect.github.com/encode/httpx/issues/3389">#3389</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/b47d94c90445921dc74f42c8390a474892c3f097"><code>b47d94c</code></a>
Avoid private imports in test cases. (<a
href="https://redirect.github.com/encode/httpx/issues/3403">#3403</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/2ea2286db4da3ba6d318e617ac03217225e9f962"><code>2ea2286</code></a>
Import ssl on demand (<a
href="https://redirect.github.com/encode/httpx/issues/3401">#3401</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/1805ee0d22f96e2b29f0500dd3076e10020004bf"><code>1805ee0</code></a>
Graceful upgrade path for 0.28. (<a
href="https://redirect.github.com/encode/httpx/issues/3394">#3394</a>)</li>
<li><a
href="https://github.com/encode/httpx/commit/41597adffa9d34171a63f7511fc0f702558dd08c"><code>41597ad</code></a>
Move remaining utility functions from _utils.py to _models.py (<a
href="https://redirect.github.com/encode/httpx/issues/3387">#3387</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/encode/httpx/compare/0.27.2...0.28.0">compare
view</a></li>
</ul>
</details>
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