.Net: Bump xunit.analyzers from 1.14.0 to 1.15.0 in /dotnet (#7399)

Bumps [xunit.analyzers](https://github.com/xunit/xunit.analyzers) from
1.14.0 to 1.15.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/95965a554f51b23032e943c2edc7b96ec043cdbb"><code>95965a5</code></a>
v1.15.0</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/a67a4c7c5f93182c34257b5ee837cb948090f5cb"><code>a67a4c7</code></a>
Create analyzer/fixer for Assert.Empty (<a
href="https://redirect.github.com/xunit/xunit.analyzers/issues/184">#184</a>)</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/db1f0c2d49ec42058de31ca271fff9ebc9366e51"><code>db1f0c2</code></a>
Update xUnit3000 to support v3's IXunitSerializable</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/fec8d6644b75b4ca01aa04cabf61f3c4824b0d6a"><code>fec8d66</code></a>
Update for v3 0.2.0</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/50dec192aa1d1ce48add9e50d2a9057879bd0332"><code>50dec19</code></a>
Update dependencies</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/0a78e6d89aee7fa7411f7e08ef28a28fd5619fb0"><code>0a78e6d</code></a>
Updated .gitignore</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/70f5c6c937464ba40fd8dba7bc223bb34a3d9b47"><code>70f5c6c</code></a>
Explicitly use latest Microsoft.CodeAnalysis.Analyzers per <a
href="https://github.com/sharwell"><code>@​sharwell</code></a></li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/412403828132c3e499a1319ab108a78d84ac8b83"><code>4124038</code></a>
Updated dependencies</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/24e3c1c97a4a2d0a64cadc208e2ee7872d8446ae"><code>24e3c1c</code></a>
<a
href="https://redirect.github.com/xunit/xunit/issues/2943">xunit/xunit#2943</a>:
Revert to only supporting Roslyn 3.11</li>
<li><a
href="https://github.com/xunit/xunit.analyzers/commit/84d0e79925c23130c5c45c0e0dadf90c1e812150"><code>84d0e79</code></a>
Add launchSettings.json to .gitignore</li>
<li>Additional commits viewable in <a
href="https://github.com/xunit/xunit.analyzers/compare/1.14.0...1.15.0">compare
view</a></li>
</ul>
</details>
<br />


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dotnet/Directory.Packages.props

@@ -105,7 +105,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageVersion Include="xunit.analyzers" Version="1.14.0" />
+    <PackageVersion Include="xunit.analyzers" Version="1.15.0" />
     <PackageReference Include="xunit.analyzers">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>