Auto merge of #28457 - servo:dependabot/cargo/rayon-core-1.9.1, r=jdm

Bump rayon-core from 1.9.0 to 1.9.1

Bumps [rayon-core](https://github.com/rayon-rs/rayon) from 1.9.0 to 1.9.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rayon-rs/rayon/blob/master/RELEASES.md">rayon-core's changelog</a>.</em></p>
<blockquote>
<h1>Release rayon 1.5.1 / rayon-core 1.9.1 (2021-05-18)</h1>
<ul>
<li>The new <code>in_place_scope</code> and <code>in_place_scope_fifo</code> are variations of <code>scope</code>
and <code>scope_fifo</code>, running the initial non-<code>Send</code> callback directly on the
current thread, rather than moving execution to the thread pool.</li>
<li>With Rust 1.51 or later, arrays now implement <code>IntoParallelIterator</code>.</li>
<li>New implementations of <code>FromParallelIterator</code> make it possible to <code>collect</code>
complicated nestings of items.
<ul>
<li><code>FromParallelIterator&lt;(A, B)&gt; for (FromA, FromB)</code> works like <code>unzip</code>.</li>
<li><code>FromParallelIterator&lt;Either&lt;L, R&gt;&gt; for (A, B)</code> works like <code>partition_map</code>.</li>
</ul>
</li>
<li>Type inference now works better with parallel <code>Range</code> and <code>RangeInclusive</code>.</li>
<li>The implementation of <code>FromParallelIterator</code> and <code>ParallelExtend</code> for
<code>Vec&lt;T&gt;</code> now uses <code>MaybeUninit&lt;T&gt;</code> internally to avoid creating any
references to uninitialized data.</li>
<li><code>ParallelBridge</code> fixed a bug with threads missing available work.</li>
</ul>
<h2>Contributors</h2>
<p>Thanks to all of the contributors for this release!</p>
<ul>
<li><a href="https://github.com/atouchet"><code>@​atouchet</code></a></li>
<li><a href="https://github.com/cuviper"><code>@​cuviper</code></a></li>
<li><a href="https://github.com/Hywan"><code>@​Hywan</code></a></li>
<li><a href="https://github.com/iRaiko"><code>@​iRaiko</code></a></li>
<li><a href="https://github.com/Qwaz"><code>@​Qwaz</code></a></li>
<li><a href="https://github.com/rocallahan"><code>@​rocallahan</code></a></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rayon-rs/rayon/commit/ebcb09b1dc53211c6b5abdf4dc5b40e4bcd0a965"><code>ebcb09b</code></a> adjust the latest release date</li>
<li><a href="https://github.com/rayon-rs/rayon/commit/93d909195b2166890c898a0f08fadda0b3b0bfc5"><code>93d9091</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/860">#860</a></li>
<li><a href="https://github.com/rayon-rs/rayon/commit/dbc026b5a8dcf6b6983ccf89e01ccea9533152ef"><code>dbc026b</code></a> Release rayon 1.5.1 / rayon-core 1.9.1</li>
<li><a href="https://github.com/rayon-rs/rayon/commit/87aae495980b583b3e515f421ee6af436b6acc16"><code>87aae49</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/859">#859</a></li>
<li><a href="https://github.com/rayon-rs/rayon/commit/2e13d8909f085a9573887fb6f2c15c76c6de185f"><code>2e13d89</code></a> Update demo dependencies</li>
<li><a href="https://github.com/rayon-rs/rayon/commit/3c7489e16816b9a90404d47cb5f5601bdda193e4"><code>3c7489e</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/855">#855</a></li>
<li><a href="https://github.com/rayon-rs/rayon/commit/0bd4ec6ceaffc893d7f8c1db679b99df9f89ab04"><code>0bd4ec6</code></a> Add <code>in_place_scope_fifo</code></li>
<li><a href="https://github.com/rayon-rs/rayon/commit/6a01573a180c89d853b7d22d20bd2f123f2df5b4"><code>6a01573</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/844">#844</a></li>
<li><a href="https://github.com/rayon-rs/rayon/commit/8815e26cf684fefbfc7bebd796e2cd22708ff828"><code>8815e26</code></a> Implement in_place_scope: a scope that runs its driver closure on the same th...</li>
<li><a href="https://github.com/rayon-rs/rayon/commit/aacced8826d2e2e6eb25b8b6358040d35644e0a7"><code>aacced8</code></a> Merge <a href="https://github-redirect.dependabot.com/rayon-rs/rayon/issues/852">#852</a></li>
<li>Additional commits viewable in <a href="https://github.com/rayon-rs/rayon/compare/rayon-core-v1.9.0...rayon-core-v1.9.1">compare view</a></li>
</ul>
</details>
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