Bump the xunit group with 2 updates

Bumps the xunit group with 2 updates: [xunit](https://github.com/xunit/xunit) and [xunit.runner.visualstudio](https://github.com/xunit/visualstudio.xunit).


Updates `xunit` from 2.6.3 to 2.6.4
- [Commits](xunit/xunit@2.6.3...2.6.4)

Updates `xunit.runner.visualstudio` from 2.5.5 to 2.5.6
- [Release notes](https://github.com/xunit/visualstudio.xunit/releases)
- [Commits](xunit/visualstudio.xunit@2.5.5...2.5.6)

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

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

tests/ApplePayJS.Tests/ApplePayJS.Tests.csproj

@@ -16,7 +16,7 @@
     <PackageReference Include="Microsoft.Playwright" Version="1.40.0" />
     <PackageReference Include="Shouldly" Version="4.2.1" />
     <PackageReference Include="xunit" Version="2.6.3" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.5" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.6" />
   </ItemGroup>
   <ItemGroup>
     <Content Include="applepay-dev.pfx;testsettings.json;xunit.runner.json" CopyToOutputDirectory="PreserveNewest" />