build(deps): bump xunit from 2.6.3 to 2.6.4

Bumps [xunit](https://github.com/xunit/xunit) from 2.6.3 to 2.6.4.
- [Commits](xunit/xunit@2.6.3...2.6.4)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

src/Projektanker.Icons.Avalonia.FontAwesome.Test/Projektanker.Icons.Avalonia.FontAwesome.Test.csproj

@@ -7,7 +7,7 @@
         <PackageReference Include="Avalonia.Skia" Version="11.0.2" />
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-        <PackageReference Include="xunit" Version="2.6.3" />
+        <PackageReference Include="xunit" Version="2.6.4" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>

src/Projektanker.Icons.Avalonia.MaterialDesign.Test/Projektanker.Icons.Avalonia.MaterialDesign.Test.csproj

@@ -7,7 +7,7 @@
         <PackageReference Include="Avalonia.Skia" Version="11.0.2" />
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-        <PackageReference Include="xunit" Version="2.6.3" />
+        <PackageReference Include="xunit" Version="2.6.4" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>

src/Projektanker.Icons.Avalonia.Test/Projektanker.Icons.Avalonia.Test.csproj

@@ -9,7 +9,7 @@
         <PackageReference Include="FluentAssertions" Version="6.12.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
         <PackageReference Include="NSubstitute" Version="5.1.0" />
-        <PackageReference Include="xunit" Version="2.6.3" />
+        <PackageReference Include="xunit" Version="2.6.4" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>