Bump Verify.Xunit from 28.4.0 to 28.6.0 (#286)

Bumps [Verify.Xunit](https://github.com/VerifyTests/Verify) from 28.4.0
to 28.6.0.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/VerifyTests/Verify/commit/67088b4b83c32c44bb6883fae88ce2c5b80eb207"><code>67088b4</code></a>
update to xunit.v3 Version 1.0.0 (<a
href="https://redirect.github.com/VerifyTests/Verify/issues/1371">#1371</a>)</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/8fc2f0229d009020fe6e565a375276380f566874"><code>8fc2f02</code></a>
Docs changes</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/893d0c38ed6cc670a4682c6fd9e0d71e002c9ee1"><code>893d0c3</code></a>
Update NUnitNugetUsage.csproj</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/941e50ccd2de558f0bd562fb2c58673eb66a9c0a"><code>941e50c</code></a>
refs</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/bed799382b1c296374416ca518a6c5e2fdb9468b"><code>bed7993</code></a>
docs</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/67fb82f6cc7a76dee42d298530910294dd5a0d30"><code>67fb82f</code></a>
Docs changes</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/7f64f415de3dd08f376edd74dd0a7c4bc09fc780"><code>7f64f41</code></a>
refs</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/09772432fa6e391aa0b475a13352f5e157a0b394"><code>0977243</code></a>
Update Directory.Build.props</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/091d12b0dd8d4c43a1e4327818e0d4ceee709c6f"><code>091d12b</code></a>
update generated date scrubbing (<a
href="https://redirect.github.com/VerifyTests/Verify/issues/1369">#1369</a>)</li>
<li><a
href="https://github.com/VerifyTests/Verify/commit/847c919ecf23fb9b4466afdbed6ef1a0e9621611"><code>847c919</code></a>
refs</li>
<li>Additional commits viewable in <a
href="https://github.com/VerifyTests/Verify/compare/28.4.0...28.6.0">compare
view</a></li>
</ul>
</details>
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build/targets/tests/Packages.props

@@ -4,7 +4,7 @@
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp.CodeFix.Testing" Version="1.1.2-beta1.24314.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Verify.Nupkg" Version="1.1.6" />
-    <PackageVersion Include="Verify.Xunit" Version="28.4.0" />
+    <PackageVersion Include="Verify.Xunit" Version="28.6.0" />
     <PackageVersion Include="xunit" Version="2.9.2" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="2.8.2" />
     <PackageVersion Include="Meziantou.Xunit.ParallelTestFramework" Version="2.3.0" />