Bump the tests group with 4 updates

Bumps the tests group with 4 updates: [xunit](https://github.com/xunit/xunit), [xunit.runner.console](https://github.com/xunit/xunit), [xunit.runner.msbuild](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.5.1 to 2.6.1
- [Commits](xunit/xunit@2.5.1...2.6.1)

Updates `xunit.runner.console` from 2.5.1 to 2.6.1
- [Commits](xunit/xunit@2.5.1...2.6.1)

Updates `xunit.runner.msbuild` from 2.5.1 to 2.6.1
- [Commits](xunit/xunit@2.5.1...2.6.1)

Updates `xunit.runner.visualstudio` from 2.5.1 to 2.5.3
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.1...2.5.3)

---
updated-dependencies:
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.console
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.msbuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: tests
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: tests
...

Signed-off-by: dependabot[bot] <[email protected]>

src/NuGetizer.Tests/NuGetizer.Tests.csproj

@@ -23,10 +23,10 @@
     <PackageReference Include="NuGet.ProjectManagement" Version="4.2.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.5.0" />
     <PackageReference Include="Microsoft.TestPlatform.ObjectModel" Version="17.5.0" />
-    <PackageReference Include="xunit" Version="2.5.1" />
-    <PackageReference Include="xunit.runner.console" Version="2.5.1" />
-    <PackageReference Include="xunit.runner.msbuild" Version="2.5.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1" PrivateAssets="all" />
+    <PackageReference Include="xunit" Version="2.6.1" />
+    <PackageReference Include="xunit.runner.console" Version="2.6.1" />
+    <PackageReference Include="xunit.runner.msbuild" Version="2.6.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.3" PrivateAssets="all" />
     <PackageReference Include="ThisAssembly.Project" Version="1.4.1" PrivateAssets="all" />
     <PackageReference Include="ThisAssembly.Strings" Version="1.4.1" PrivateAssets="all" />
   </ItemGroup>