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="9f25dcc28d"><code>9f25dcc</code></a> Use <code>dyn Trait</code> syntax everywhere since it is supported by this library's MSRV.</li>
<li><a href="c7ef06ece3"><code>c7ef06e</code></a> Correct the min-supported Rust version to be 1.33 in the docs.</li>
<li><a href="1e2da5c648"><code>1e2da5c</code></a> Bump version to 1.1.0.</li>
<li><a href="b512ab3ba2"><code>b512ab3</code></a> Updated README.md and CHANGELOG.md with information about Rc and Arc downcast...</li>
<li><a href="f47f70c5b6"><code>f47f70c</code></a> Update CHANGELOG and bump version to 1.0.4.</li>
<li><a href="8a363ac3a9"><code>8a363ac</code></a> Add local_inner_macros to impl_downcast to allow invocation via namespace.</li>
<li><a href="183a01b703"><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="68e49a33ea"><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="19d078242a"><code>19d0782</code></a> Use <code>$crate</code> prefix for internal macro calls</li>
<li><a href="817d7d00e2"><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 />

[![Dependabot compatibility score](https://api.dependabot.com/badges/compatibility_score?dependency-name=downcast-rs&package-manager=cargo&previous-version=1.0.3&new-version=1.1.1)](https://dependabot.com/compatibility-score/?dependency-name=downcast-rs&package-manager=cargo&previous-version=1.0.3&new-version=1.1.1)

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

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

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits that have been made to it
- `@dependabot merge` will merge this PR after your CI passes on it
- `@dependabot squash and merge` will squash and merge this PR after your CI passes on it
- `@dependabot cancel merge` will cancel a previously requested merge and block automerging
- `@dependabot reopen` will reopen this PR if it is closed
- `@dependabot close` will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
- `@dependabot ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
- `@dependabot use these labels` will set the current labels as the default for future PRs for this repo and language
- `@dependabot use these reviewers` will set the current reviewers as the default for future PRs for this repo and language
- `@dependabot use these assignees` will set the current assignees as the default for future PRs for this repo and language
- `@dependabot use this milestone` will set the current milestone as the default for future PRs for this repo and language
- `@dependabot badge me` will comment on this PR with code to add a "Dependabot enabled" badge to your readme

Additionally, you can set the following in your Dependabot [dashboard](https://app.dependabot.com):
- Update frequency (including time of day and day of week)
- Pull request limits (per update run and/or open at any time)
- Out-of-range updates (receive only lockfile updates, if desired)
- Security updates (receive only security updates, if desired)

</details>

Cargo.lock

@@ -1310,9 +1310,9 @@ dependencies = [
 
 [[package]]
 name = "downcast-rs"
-version = "1.0.3"
+version = "1.1.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "18df8ce4470c189d18aa926022da57544f31e154631eb4cfe796aea97051fe6c"
+checksum = "52ba6eb47c2131e784a38b726eb54c1e1484904f013e576a25354d0124161af6"
 
 [[package]]
 name = "dtoa"