Auto merge of #27827 - servo:dependabot/cargo/futures-0.1.30, r=jdm

Bump futures from 0.1.28 to 0.1.30

Bumps [futures](https://github.com/rust-lang/futures-rs) from 0.1.28 to 0.1.30.
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/rust-lang/futures-rs/commit/6db66422556cb587ebd7923087ee8bb154b1b6b5"><code>6db6642</code></a> Release 0.1.30</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/8f9c4a6824044124d71415c6cc6511a540e26743"><code>8f9c4a6</code></a> Allow deprecated warnings (<a href="https://github-redirect.dependabot.com/rust-lang/futures-rs/issues/2221">#2221</a>)</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/cbaaac24d550b48c244d16b630b1ddde7dd45ec5"><code>cbaaac2</code></a> Backport to 0.1: Shared must relinquish control to the executor if repolled</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/b85f56d85c33925d2580f58d586132edafc7e1f0"><code>b85f56d</code></a> Backport to 0.1: Avoid starvation from FuturesUnordered::poll_next</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/a00d35efcb5bfa5581f695618ca7b77068998fa0"><code>a00d35e</code></a> Don't bypass stream fuse in 0.1 Forward</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/56f8eb99eb66e19267df42cf4d3fd459b87f4c77"><code>56f8eb9</code></a> 0.1.29 release</li>
<li><a href="https://github.com/rust-lang/futures-rs/commit/ad7830d8b79ea397cba73297a59d3eedf3a7491c"><code>ad7830d</code></a> add must_use attributes on Future and Stream</li>
<li>See full diff in <a href="https://github.com/rust-lang/futures-rs/compare/0.1.28...0.1.30">compare view</a></li>
</ul>
</details>
<br />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=futures&package-manager=cargo&previous-version=0.1.28&new-version=0.1.30)](https://dependabot.com/compatibility-score/?dependency-name=futures&package-manager=cargo&previous-version=0.1.28&new-version=0.1.30)

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[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

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