Auto merge of #28150 - servo:dependabot/cargo/idna-0.2.1, r=jdm

Bump idna from 0.2.0 to 0.2.1

Bumps [idna](https://github.com/servo/rust-url) from 0.2.0 to 0.2.1.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/servo/rust-url/commit/69417ec89b4b35adc4cc0e0082081d9112d2a26d"><code>69417ec</code></a> v0.2.1</li>
<li><a href="https://github.com/servo/rust-url/commit/52ea4ba2b3de9ebee13e7936808e45cf11d3e4e4"><code>52ea4ba</code></a> Merge branch 'master' into crates.io</li>
<li><a href="https://github.com/servo/rust-url/commit/46458f80e48c542b2f175e36e5b7d30782ca7dc5"><code>46458f8</code></a> Upgrade to rustc 81eeec094 2014-11-21.</li>
<li><a href="https://github.com/servo/rust-url/commit/3d757ec4725de2b72eed116144e1e5718c4d9c86"><code>3d757ec</code></a> v0.2.0</li>
<li><a href="https://github.com/servo/rust-url/commit/94e637886a14d20ea58d8fb35a7577c096b30791"><code>94e6378</code></a> Merge branch 'master' into crates.io</li>
<li><a href="https://github.com/servo/rust-url/commit/a838a41263472de966f7ec8db758caa9cc4699a4"><code>a838a41</code></a> Apprently &quot;cannot&quot; and &quot;can not&quot; are not identical.</li>
<li><a href="https://github.com/servo/rust-url/commit/4e30f965cc108e317f16c413460ce34a2225082e"><code>4e30f96</code></a> Simplify and document the signature of EncodingOverride::encode.</li>
<li><a href="https://github.com/servo/rust-url/commit/9ae1fd2fc3ca407ed815313289ee4d2aa43662df"><code>9ae1fd2</code></a> Make rust-encoding an optional feature.</li>
<li><a href="https://github.com/servo/rust-url/commit/e6866f2a870b1aa330bb43adf1df907b55989be4"><code>e6866f2</code></a> Drop isindex support. We’ll see if anyone asks for it.</li>
<li><a href="https://github.com/servo/rust-url/commit/00c0111b89b94eb7c20e85eccec7ac44cb87720c"><code>00c0111</code></a> Dont transmute non-UTF-8 bytes to str, even though it kinda maybe looks safe.</li>
<li>Additional commits viewable in <a href="https://github.com/servo/rust-url/compare/idna-v0.2.0...v0.2.1">compare view</a></li>
</ul>
</details>
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[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=idna&package-manager=cargo&previous-version=0.2.0&new-version=0.2.1)](https://dependabot.com/compatibility-score/?dependency-name=idna&package-manager=cargo&previous-version=0.2.0&new-version=0.2.1)

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