Bump xunit

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.1 to 2.5.3.
- [Commits](xunit/xunit@2.5.1...2.5.3)

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

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

Author: dependabot[bot]

samples/snippets/core/tutorials/testing-with-cli/csharp/test/NewTypesTests/NewTypesTests.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
-    <PackageReference Include="xunit" Version="2.5.1" />
+    <PackageReference Include="xunit" Version="2.5.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.5.1" />
   </ItemGroup>