Auto merge of #28812 - servo:dependabot/cargo/wayland-client-0.28.6, r=jdm

Bump wayland-client from 0.28.5 to 0.28.6

Bumps [wayland-client](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-client'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

@@ -7129,9 +7129,9 @@ checksum = "a91c2916119c17a8e316507afaaa2dd94b47646048014bbdf6bef098c1bb58ad"
 
 [[package]]
 name = "wayland-client"
-version = "0.28.5"
+version = "0.28.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "06ca44d86554b85cf449f1557edc6cc7da935cc748c8e4bf1c507cbd43bae02c"
+checksum = "e3ab332350e502f159382201394a78e3cc12d0f04db863429260164ea40e0355"
 dependencies = [
  "bitflags",
  "downcast-rs",
@@ -7140,19 +7140,19 @@ dependencies = [
  "scoped-tls",
  "wayland-commons",
  "wayland-scanner",
- "wayland-sys 0.28.5",
+ "wayland-sys 0.28.6",
 ]
 
 [[package]]
 name = "wayland-commons"
-version = "0.28.5"
+version = "0.28.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8bd75ae380325dbcff2707f0cd9869827ea1d2d6d534cff076858d3f0460fd5a"
+checksum = "a21817947c7011bbd0a27e11b17b337bfd022e8544b071a2641232047966fbda"
 dependencies = [
  "nix 0.20.0",
  "once_cell",
  "smallvec 1.8.0",
- "wayland-sys 0.28.5",
+ "wayland-sys 0.28.6",
 ]
 
 [[package]]
@@ -7180,9 +7180,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-scanner"
-version = "0.28.5"
+version = "0.28.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "389d680d7bd67512dc9c37f39560224327038deb0f0e8d33f870900441b68720"
+checksum = "ce923eb2deb61de332d1f356ec7b6bf37094dc5573952e1c8936db03b54c03f1"
 dependencies = [
  "proc-macro2",
  "quote",
@@ -7201,9 +7201,9 @@ dependencies = [
 
 [[package]]
 name = "wayland-sys"
-version = "0.28.5"
+version = "0.28.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2907bd297eef464a95ba9349ea771611771aa285b932526c633dc94d5400a8e2"
+checksum = "d841fca9aed7febf9bed2e9796c49bf58d4152ceda8ac949ebe00868d8f0feb8"
 dependencies = [
  "dlib 0.5.0",
  "lazy_static",