Auto merge of #26762 - servo:dependabot/cargo/rand_chacha-0.2.2, r=jdm

Bump rand_chacha from 0.2.1 to 0.2.2

Bumps [rand_chacha](https://github.com/rust-random/rand) from 0.2.1 to 0.2.2.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-random/rand/blob/master/CHANGELOG.md">rand_chacha's changelog</a>.</em></p>
<blockquote>
<h1>Changelog</h1>
<p>All notable changes to this project will be documented in this file.</p>
<p>The format is based on <a href="http://keepachangelog.com/en/1.0.0/">Keep a Changelog</a>
and this project adheres to <a href="https://semver.org/spec/v2.0.0.html">Semantic Versioning</a>.</p>
<p>A <a href="https://github.com/rust-random/rand/blob/master/rand_core/CHANGELOG.md">separate changelog is kept for rand_core</a>.</p>
<p>You may also find the <a href="https://rust-random.github.io/book/update.html">Upgrade Guide</a> useful.</p>
<h2>[Unreleased]</h2>
<h3>Additions</h3>
<ul>
<li>impl PartialEq+Eq for StdRng, SmallRng, and StepRng (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/975">#975</a>)</li>
<li>Added a <code>serde1</code> feature and added Serialize/Deserialize to <code>UniformInt</code> and <code>WeightedIndex</code> (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/974">#974</a>)</li>
</ul>
<h2>[0.7.3] - 2020-01-10</h2>
<h3>Fixes</h3>
<ul>
<li>The <code>Bernoulli</code> distribution constructors now reports an error on NaN and on
<code>denominator == 0</code>. (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/925">#925</a>)</li>
<li>Use <code>std::sync::Once</code> to register fork handler, avoiding possible atomicity violation (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/928">#928</a>)</li>
<li>Fix documentation on the precision of generated floating-point values</li>
</ul>
<h3>Changes</h3>
<ul>
<li>Unix: make libc dependency optional; only use fork protection with std feature (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/928">#928</a>)</li>
</ul>
<h3>Additions</h3>
<ul>
<li>Implement <code>std::error::Error</code> for <code>BernoulliError</code> (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/919">#919</a>)</li>
</ul>
<h2>[0.7.2] - 2019-09-16</h2>
<h3>Fixes</h3>
<ul>
<li>Fix dependency on <code>rand_core</code> 0.5.1 (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/890">#890</a>)</li>
</ul>
<h3>Additions</h3>
<ul>
<li>Unit tests for value stability of distributions added (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/888">#888</a>)</li>
</ul>
<h2>[0.7.1] - 2019-09-13</h2>
<h3>Yanked</h3>
<p>This release was yanked since it depends on <code>rand_core::OsRng</code> added in 0.5.1
but specifies a dependency on version 0.5.0 (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/890">#890</a>), causing a broken builds
when updating from <code>rand 0.7.0</code> without also updating <code>rand_core</code>.</p>
<h3>Fixes</h3>
<ul>
<li>Fix <code>no_std</code> behaviour, appropriately enable c2-chacha's <code>std</code> feature (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/844">#844</a>)</li>
<li><code>alloc</code> feature in <code>no_std</code> is available since Rust 1.36 (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/856">#856</a>)</li>
<li>Fix or squelch issues from Clippy lints (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/840">#840</a>)</li>
</ul>
<h3>Additions</h3>
<ul>
<li>Add a <code>no_std</code> target to CI to continuously evaluate <code>no_std</code> status (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/844">#844</a>)</li>
<li><code>WeightedIndex</code>: allow adjusting a sub-set of weights (<a href="https://github-redirect.dependabot.com/rust-random/rand/issues/866">#866</a>)</li>
</ul>
</tr></table> ... (truncated)
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rust-random/rand/commit/e2112c4404c61d3850c0e91f48114db5daf06569"><code>e2112c4</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-random/rand/issues/950">#950</a> from coltfred/rand-chacha-0.2.2</li>
<li><a href="https://github.com/rust-random/rand/commit/c67a857b160782c0f8f313a4ed71a44249d87a9a"><code>c67a857</code></a> Update changelog for rand-chacha 0.2.2</li>
<li><a href="https://github.com/rust-random/rand/commit/8ed19df4fd298ce3fe66a70bb5f85dae082fba72"><code>8ed19df</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-random/rand/issues/944">#944</a> from coltfred/crypto-rng-chachacore</li>
<li><a href="https://github.com/rust-random/rand/commit/108632c9007b6f6e8e559598d42c8daa5a53c21a"><code>108632c</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/rust-random/rand/issues/940">#940</a> from dhardy/work</li>
<li><a href="https://github.com/rust-random/rand/commit/5ecaeb3b4fdb12450b77666b87d921208703314a"><code>5ecaeb3</code></a> Add CryptoRng marker trait to ChaChaXCore</li>
<li><a href="https://github.com/rust-random/rand/commit/d66d4d169c871fd16b9eed208ea941ec5412201b"><code>d66d4d1</code></a> Impl Fill for slices over bool, char, f32, f64</li>
<li><a href="https://github.com/rust-random/rand/commit/eccd1f8f7e6c62df5354f80c3403994a77d48b68"><code>eccd1f8</code></a> Optimise: avoid inlining</li>
<li><a href="https://github.com/rust-random/rand/commit/7bdfa855e2cef2b97693352acd54db1c4f1023eb"><code>7bdfa85</code></a> Replace AsByteSliceMut with Fill</li>
<li><a href="https://github.com/rust-random/rand/commit/571c9af9a63d939e849c1cc100e4084ec46e195a"><code>571c9af</code></a> Misc bench: add gen_1kb_u16_*</li>
<li><a href="https://github.com/rust-random/rand/commit/6403c10d6477564f6c4e7562252feb6fb533c59c"><code>6403c10</code></a> Move Rng trait to sub-module</li>
<li>Additional commits viewable in <a href="https://github.com/rust-random/rand/compare/rand_chacha-0.2.1...rand_chacha-0.2.2">compare view</a></li>
</ul>
</details>
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