Auto merge of #27950 - servo:dependabot/cargo/indexmap-1.6.1, r=jdm

Bump indexmap from 1.6.0 to 1.6.1

Bumps [indexmap](https://github.com/bluss/indexmap) from 1.6.0 to 1.6.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/bluss/indexmap/commit/453278eb98b2d6fd6c988eb6cfd1fa879b0722a0"><code>453278e</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/indexmap/issues/165">#165</a> from cuviper/release-1.6.1</li>
<li><a href="https://github.com/bluss/indexmap/commit/4728acf9ab2761a7d5897714dcbc20d98a13affa"><code>4728acf</code></a> Release 1.6.1</li>
<li><a href="https://github.com/bluss/indexmap/commit/ea8abb2982a8683f5dbceccf11323ca67e12ec41"><code>ea8abb2</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/indexmap/issues/158">#158</a> from cuviper/serde_seq</li>
<li><a href="https://github.com/bluss/indexmap/commit/3b33a8e20721ec9cafbb7ae89b774e1de6802a8c"><code>3b33a8e</code></a> Add serde_seq to serialize maps as a sequence</li>
<li><a href="https://github.com/bluss/indexmap/commit/dade2bfb65cd3ebc113a510cd75cc9ccfae4c256"><code>dade2bf</code></a> Use collect_map/seq to simplify serializers</li>
<li><a href="https://github.com/bluss/indexmap/commit/b5ac29e8065d4e342036e92432a8df3a14559104"><code>b5ac29e</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/indexmap/issues/160">#160</a> from cuviper/more-vec</li>
<li><a href="https://github.com/bluss/indexmap/commit/4819253412022a675da85f90b9539afe0fa28536"><code>4819253</code></a> Document the first/last methods</li>
<li><a href="https://github.com/bluss/indexmap/commit/eca535de3a9724e1e36f7102b5ba14f3617c7c26"><code>eca535d</code></a> Return &amp;K in first_mut/last_mut</li>
<li><a href="https://github.com/bluss/indexmap/commit/63788568c0a9e0f5959721131aec75799a40f647"><code>6378856</code></a> Add more Vec/slice-like methods to maps and sets</li>
<li><a href="https://github.com/bluss/indexmap/commit/59e283344fe4ffbaa26f82b06eb9c20cca29a4b0"><code>59e2833</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/indexmap/issues/164">#164</a> from bluss/gh-actions</li>
<li>Additional commits viewable in <a href="https://github.com/bluss/indexmap/compare/1.6.0...1.6.1">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=indexmap&package-manager=cargo&previous-version=1.6.0&new-version=1.6.1)](https://dependabot.com/compatibility-score/?dependency-name=indexmap&package-manager=cargo&previous-version=1.6.0&new-version=1.6.1)

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