Auto merge of #28796 - servo:dependabot/cargo/either-1.6.1, r=jdm

Bump either from 1.5.3 to 1.6.1

Bumps [either](https://github.com/bluss/either) from 1.5.3 to 1.6.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="6d3216446d"><code>6d32164</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/either/issues/51">#51</a> from spenserblack/feature/unwrap-expect</li>
<li><a href="6e9590032b"><code>6e95900</code></a> Release 1.6.1</li>
<li><a href="7f3a36833d"><code>7f3a368</code></a> Add expects</li>
<li><a href="7f092c69d0"><code>7f092c6</code></a> Add unwraps</li>
<li><a href="1ed67aa0e5"><code>1ed67aa</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/bluss/either/issues/50">#50</a> from cuviper/release-1.6.0</li>
<li><a href="fd7188e2f0"><code>fd7188e</code></a> Release 1.6.0</li>
<li><a href="27a81dbb0f"><code>27a81db</code></a> Add spacing to the untagged examples</li>
<li><a href="89c0b2cc5e"><code>89c0b2c</code></a> Pattern-match untagged serialization directly</li>
<li><a href="4943fbbc0a"><code>4943fbb</code></a> Avoid deprecated try!</li>
<li><a href="8e61186f32"><code>8e61186</code></a> Allow deprecated Error::description call</li>
<li>Additional commits viewable in <a href="https://github.com/bluss/either/compare/1.5.3...1.6.1">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -1544,9 +1544,9 @@ dependencies = [
 
 [[package]]
 name = "either"
-version = "1.5.3"
+version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
+checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
 [[package]]
 name = "embedder_traits"