Bump sphinxcontrib-spelling from 7.0.1 to 7.1.0 (#5211)

Bumps [sphinxcontrib-spelling](https://github.com/sphinx-contrib/spelling) from 7.0.1 to 7.1.0.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/76127431a996ee6f69fc43f359404a9ca488c9dd"><code>7612743</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/118">#118</a> from dhellmann/release-note-warning-option</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/1704c575e1592a9647122f938185f6e2437e6190"><code>1704c57</code></a> add release note for <code>spelling_warning</code> option</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/aa5971d71095e027cf1ef9aa85c08787a1ee6803"><code>aa5971d</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/117">#117</a> from dhellmann/django-integration-github-action</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/09e409f466611291fda37a4ce2392a5e6859a495"><code>09e409f</code></a> add integration test to github actions</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/111866ff1af85311a9606500759d818b7c10786d"><code>111866f</code></a> add spelling_warning configuration option (<a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/116">#116</a>)</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/a7780b4467b337938a16cf5c901c0474880994f4"><code>a7780b4</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/115">#115</a> from dhellmann/limit-release-action</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/d49f8981c0278b64ade788011d51456f7267cfdb"><code>d49f898</code></a> do not run the build-n-publish job on forks of the repo</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/cbec5dc9d44fdd5bb6f1840f45b427ea6a276b42"><code>cbec5dc</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/114">#114</a> from dhellmann/release-check-depth</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/525c75317f3bb11449093cc7d90d081025320997"><code>525c753</code></a> clone the whole repo when building release</li>
<li><a href="https://github.com/sphinx-contrib/spelling/commit/27fb6a40ac1575c5ceb575e086f3f7a85f7dc757"><code>27fb6a4</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/sphinx-contrib/spelling/issues/113">#113</a> from dhellmann/fix-pypi-publish</li>
<li>Additional commits viewable in <a href="https://github.com/sphinx-contrib/spelling/compare/7.0.1...7.1.0">compare view</a></li>
</ul>
</details>
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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

requirements/doc-spelling.txt

@@ -1,2 +1,2 @@
 -r doc.txt
-sphinxcontrib-spelling==7.0.1; platform_system!="Windows"  # We only use it in Travis CI
+sphinxcontrib-spelling==7.1.0; platform_system!="Windows"  # We only use it in Travis CI