Bump the visual-studio-dependencies group (#261)

Bumps the visual-studio-dependencies group in /visual-studio with 4 updates: Microsoft.VSSDK.BuildTools, [xunit](https://github.com/xunit/xunit), [xunit.runner.msbuild](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `Microsoft.VSSDK.BuildTools` from 17.8.2365 to 17.9.3168

Updates `xunit` from 2.6.6 to 2.7.0
- [Commits](xunit/xunit@2.6.6...2.7.0)

Updates `xunit.runner.msbuild` from 2.6.6 to 2.7.0
- [Commits](xunit/xunit@2.6.6...2.7.0)

Updates `xunit.runner.visualstudio` from 2.5.6 to 2.5.7
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.6...2.5.7)

---
updated-dependencies:
- dependency-name: Microsoft.VSSDK.BuildTools
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: visual-studio-dependencies
- dependency-name: xunit
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: visual-studio-dependencies
- dependency-name: xunit.runner.msbuild
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: visual-studio-dependencies
- dependency-name: xunit.runner.visualstudio
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: visual-studio-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

visual-studio/tests/GitWebLinks.UnitTests/GitWebLinks.UnitTests.csproj

@@ -17,7 +17,7 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
-        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6">
+        <PackageReference Include="xunit.runner.visualstudio" Version="2.5.7">
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
             <PrivateAssets>all</PrivateAssets>
         </PackageReference>