Auto merge of #28843 - servo:dependabot/cargo/wayland-protocols-0.28.6, r=jdm

Bump wayland-protocols from 0.28.5 to 0.28.6

Bumps [wayland-protocols](https://github.com/smithay/wayland-rs) from 0.28.5 to 0.28.6.
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a href="https://github.com/Smithay/wayland-rs/blob/master/historical_changelog.md">wayland-protocols's changelog</a>.</em></p>
<blockquote>
<h2>0.28.6 -- 2021-06-29</h2>
<h4>Additions</h4>
<ul>
<li>[protocols] Update <code>wlr-protocols</code> to commit <code>d1598e82240d6e8ca57729495a94d4e11d222033</code>,
updating <code>wlr-layer-shell</code> to version 4.</li>
<li>[client] Added the possibility to handle attributes for <code>event_enum!</code> macro.</li>
<li>[server] Added the possibility to handle attributes for <code>request_enum!</code> macro.</li>
<li>[server] Added <code>PartialEq</code> implementation for <code>Client</code> structure.</li>
</ul>
<h4>Bugfixes</h4>
<ul>
<li>[client] Allow invocations of <code>event_enum!</code> without prior imports with <code>use</code></li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a href="c121575dfe"><code>c121575</code></a> v0.28.6</li>
<li><a href="e7ff5b24d3"><code>e7ff5b2</code></a> sys: use memoffset to avoid UB</li>
<li><a href="23a3e63fb3"><code>23a3e63</code></a> Add debug implementations</li>
<li><a href="3465ca7470"><code>3465ca7</code></a> Added <code>PartialEq</code> implementation for the <code>Client</code> structure. (<a href="https://github-redirect.dependabot.com/smithay/wayland-rs/issues/390">#390</a>)</li>
<li><a href="49484c2fc2"><code>49484c2</code></a> client: Fix not found macro (<a href="https://github-redirect.dependabot.com/smithay/wayland-rs/issues/388">#388</a>)</li>
<li><a href="e5914f5322"><code>e5914f5</code></a> Update wlr-protocols (<a href="https://github-redirect.dependabot.com/smithay/wayland-rs/issues/386">#386</a>)</li>
<li><a href="b77df04403"><code>b77df04</code></a> Added to <code>request_enum</code> and <code>event_enum</code> the possibility to handle attributes...</li>
<li><a href="b1c3d8a6b6"><code>b1c3d8a</code></a> ci: workaround a rustup bug in freebsd</li>
<li><a href="4c22016aac"><code>4c22016</code></a> Use a BufWriter in simple_window example</li>
<li><a href="e0b35a6f2b"><code>e0b35a6</code></a> client: fix simple_window example</li>
<li>Additional commits viewable in <a href="https://github.com/smithay/wayland-rs/compare/v0.28.5...v0.28.6">compare view</a></li>
</ul>
</details>
<br />

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Cargo.lock

@@ -7218,9 +7218,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-protocols"
-version = "0.28.5"
+version = "0.28.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "95df3317872bcf9eec096c864b69aa4769a1d5d6291a5b513f8ba0af0efbd52c"
+checksum = "286620ea4d803bacf61fa087a4242ee316693099ee5a140796aaba02b29f861f"
 dependencies = [
  "bitflags",
  "wayland-client",