Auto merge of #26612 - servo:dependabot/cargo/downcast-rs-1.1.1, r=jdm

Bump downcast-rs from 1.0.3 to 1.1.1

Bumps [downcast-rs](https://github.com/marcianx/downcast-rs) from 1.0.3 to 1.1.1.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/marcianx/downcast-rs/blob/v1.1.1/CHANGELOG.md">downcast-rs's changelog</a>.</em></p>
<blockquote>
<h2>1.1.1 - 2019-10-28</h2>
<h3>Changed</h3>
<ul>
<li>Used <code>dyn Trait</code> syntax everywhere since it is supported by downcast-rs's
min-supported rust version (1.33).</li>
</ul>
<h2>1.1.0 - 2019-10-07</h2>
<h3>Added</h3>
<ul>
<li>Support for downcasting <code>Rc&lt;Trait&gt;</code> and <code>Arc&lt;Trait&gt;</code>.</li>
</ul>
<h3>Changed</h3>
<ul>
<li>Minimum supported Rust version upped to 1.33 to support <code>Rc</code> and <code>Arc</code> in the
receiver position.</li>
</ul>
<h2>1.0.4 - 2019-04-08</h2>
<h3>Changed</h3>
<ul>
<li>Added <code>local_inner_macros</code> to <code>impl_downcast</code> to allow invoking via namespace.</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="https://github.com/marcianx/downcast-rs/commit/9f25dcc28d2abf8eee79bec07683609fc28e97e2"><code>9f25dcc</code></a> Use <code>dyn Trait</code> syntax everywhere since it is supported by this library's MSRV.</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/c7ef06ece35dc95718afe572a64b64de124ae28b"><code>c7ef06e</code></a> Correct the min-supported Rust version to be 1.33 in the docs.</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/1e2da5c6481366b56a884cc4ed8789264126a759"><code>1e2da5c</code></a> Bump version to 1.1.0.</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/b512ab3ba2183932c7a062bc3d5b41ffc084168f"><code>b512ab3</code></a> Updated README.md and CHANGELOG.md with information about Rc and Arc downcast...</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/f47f70c5b612eb38a588bd88bb2ccad6f59e89e8"><code>f47f70c</code></a> Update CHANGELOG and bump version to 1.0.4.</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/8a363ac3a959d7235ad748ddaa5e2cc9367510e8"><code>8a363ac</code></a> Add local_inner_macros to impl_downcast to allow invocation via namespace.</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/183a01b703ecf0dfbf4dba9900d0d925637eb0f9"><code>183a01b</code></a> Revert &quot;Merge pull request <a href="https://github-redirect.dependabot.com/marcianx/downcast-rs/issues/6">#6</a> from dkaste/master&quot; (in favor of local_inner_ma...</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/68e49a33eadf7eeab0e78f9c4923a0a4196e57e7"><code>68e49a3</code></a> Merge pull request <a href="https://github-redirect.dependabot.com/marcianx/downcast-rs/issues/6">#6</a> from dkaste/master</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/19d078242a200114dcb073242c29b1c94e847654"><code>19d0782</code></a> Use <code>$crate</code> prefix for internal macro calls</li>
<li><a href="https://github.com/marcianx/downcast-rs/commit/817d7d00e21761ace9be5b8af07a9fcf4cf42da2"><code>817d7d0</code></a> Update crate description and the README.md to reflect lib.rs doc changes.</li>
<li>Additional commits viewable in <a href="https://github.com/marcianx/downcast-rs/compare/v1.0.3...v1.1.1">compare view</a></li>
</ul>
</details>
<br />

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