Auto merge of #28184 - servo:dependabot/cargo/futures-sink-0.3.13, r=jdm

Bump futures-sink from 0.3.12 to 0.3.13

Bumps [futures-sink](https://github.com/rust-lang/futures-rs) from 0.3.12 to 0.3.13.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/futures-rs/releases">futures-sink's releases</a>.</em></p>
<blockquote>
<h2>0.3.13</h2>
<ul>
<li>Mitigated starvation issues in <code>FuturesUnordered</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2333">#2333</a>)</li>
<li>Fixed race with dropping <code>mpsc::Receiver</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2304">#2304</a>)</li>
<li>Added <code>Shared::{strong_count, weak_count}</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2346">#2346</a>)</li>
<li>Added <code>no_std</code> support for <code>task::noop_waker_ref</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2332">#2332</a>)</li>
<li>Implemented <code>Stream::size_hint</code> for <code>Either</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2325">#2325</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/rust-lang/futures-rs/blob/master/CHANGELOG.md">futures-sink's changelog</a>.</em></p>
<blockquote>
<h1>0.3.13 - 2021-02-23</h1>
<ul>
<li>Mitigated starvation issues in <code>FuturesUnordered</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2333">#2333</a>)</li>
<li>Fixed race with dropping <code>mpsc::Receiver</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2304">#2304</a>)</li>
<li>Added <code>Shared::{strong_count, weak_count}</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2346">#2346</a>)</li>
<li>Added <code>no_std</code> support for <code>task::noop_waker_ref</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2332">#2332</a>)</li>
<li>Implemented <code>Stream::size_hint</code> for <code>Either</code> (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2325">#2325</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="c91f869167"><code>c91f869</code></a> Release 0.3.13 (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2350">#2350</a>)</li>
<li><a href="c29a73af21"><code>c29a73a</code></a> Document poll!(stream.next()) pattern for poll!(..) (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2357">#2357</a>)</li>
<li><a href="df6353e23c"><code>df6353e</code></a> Fix some typos in doc-comments (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2354">#2354</a>)</li>
<li><a href="18e46e804f"><code>18e46e8</code></a> tests: cfg-ignore compat tests if there is no compat feature (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2353">#2353</a>)</li>
<li><a href="f86bb460ec"><code>f86bb46</code></a> Add CODEOWNERS (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2351">#2351</a>)</li>
<li><a href="e981716f47"><code>e981716</code></a> Fix clippy::manual_flatten warning (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2347">#2347</a>)</li>
<li><a href="f273d3beab"><code>f273d3b</code></a> FuturesUnordered: Do not poll the same future twice per iteration (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2333">#2333</a>)</li>
<li><a href="4959eccd57"><code>4959ecc</code></a> Add strong/weak pointer counts to Shared (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2346">#2346</a>)</li>
<li><a href="6acaa815bc"><code>6acaa81</code></a> small change in <code>select</code> example. (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2345">#2345</a>)</li>
<li><a href="59f62b04d9"><code>59f62b0</code></a> Disable rustfmt (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2339">#2339</a>)</li>
<li>Additional commits viewable in <a href="https://github.com/rust-lang/futures-rs/compare/0.3.12...0.3.13">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -1848,9 +1848,9 @@ dependencies = [
 
 [[package]]
 name = "futures-sink"
-version = "0.3.12"
+version = "0.3.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "caf5c69029bda2e743fddd0582d1083951d65cc9539aebf8812f36c3491342d6"
+checksum = "85754d98985841b7d4f5e8e6fbfa4a4ac847916893ec511a2917ccd8525b8bb3"
 
 [[package]]
 name = "futures-task"