Bump xunit from 2.7.1 to 2.9.3 in /src

Bumps [xunit](https://github.com/xunit/xunit) from 2.7.1 to 2.9.3.
- [Commits](xunit/xunit@v2-2.7.1...v2-2.9.3)

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

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

Author: dependabot[bot]

src/Test/Test.csproj

@@ -16,7 +16,7 @@
 
     <ItemGroup>
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
-        <PackageReference Include="xunit" Version="2.7.1" />
+        <PackageReference Include="xunit" Version="2.9.3" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" />
         <PackageReference Include="System.Buffers" Version="4.5.1" />
         <PackageReference Include="System.Reflection.TypeExtensions" Version="4.7.0" />