Bump pest from 2.7.0 to 2.7.3 (#48)

Bumps [pest](https://github.com/pest-parser/pest) from 2.7.0 to 2.7.3.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/pest-parser/pest/commit/ec61e9219f117a9602ca1eab3362a77934e548ec"><code>ec61e92</code></a>
small cargo clippy fixes + dependency bumps (<a
href="https://redirect.github.com/pest-parser/pest/issues/921">#921</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/734ba66ad73229d54b10aa1197a9c0ad62014943"><code>734ba66</code></a>
A new stack implementation that should be faster and less
space-consuming (<a
href="https://redirect.github.com/pest-parser/pest/issues/905">#905</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/fe53557291766e385443f7f618c627bf46550162"><code>fe53557</code></a>
docs: fix small typo in <code>match_range</code> (<a
href="https://redirect.github.com/pest-parser/pest/issues/906">#906</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/5bfa99ef3caaa93e649a7d8825a983d54458352d"><code>5bfa99e</code></a>
propagate non_exhaustive attribute to the generated Rule enums (<a
href="https://redirect.github.com/pest-parser/pest/issues/901">#901</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/da0feb03c031d65b5f96fc3c651466392373e52b"><code>da0feb0</code></a>
Add feature gated <code>Cow</code> module paths (<a
href="https://redirect.github.com/pest-parser/pest/issues/900">#900</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/4d51b5b75c56b03e13eb21d3e36a5bbe8285a640"><code>4d51b5b</code></a>
Update license field following SPDX 2.1 license expression standard (<a
href="https://redirect.github.com/pest-parser/pest/issues/898">#898</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/02cffe677fdfe881431c7317c7bd583f6409e9b0"><code>02cffe6</code></a>
Implement Display for Expr and OptimizedExpr (<a
href="https://redirect.github.com/pest-parser/pest/issues/896">#896</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/ac0aed3eecf435fd93ba575a39704aaa88a375b7"><code>ac0aed3</code></a>
Adding get_input() to types that already have public as_str() 🏷️ (<a
href="https://redirect.github.com/pest-parser/pest/issues/890">#890</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/48e0a8bd3d43a17c1c78f099610b745d18ec0c5f"><code>48e0a8b</code></a>
Implement core::fmt::Display for OptimizedExpr (<a
href="https://redirect.github.com/pest-parser/pest/issues/889">#889</a>)</li>
<li><a
href="https://github.com/pest-parser/pest/commit/597e09b09d632da892bb8a9e31879483960a15c6"><code>597e09b</code></a>
Merging Spans ♻️ (<a
href="https://redirect.github.com/pest-parser/pest/issues/887">#887</a>)</li>
<li>Additional commits viewable in <a
href="https://github.com/pest-parser/pest/compare/v2.7.0...v2.7.3">compare
view</a></li>
</ul>
</details>
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