Bump xunit from 2.5.3 to 2.8.1

Bumps [xunit](https://github.com/xunit/xunit) from 2.5.3 to 2.8.1.
- [Commits](xunit/xunit@2.5.3...2.8.1)

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

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

Source/Sam.DynamicPredicateTests/Sam.DynamicPredicateTests.csproj

@@ -12,7 +12,7 @@
   <ItemGroup>
     <PackageReference Include="coverlet.collector" Version="6.0.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.8.0" />
-    <PackageReference Include="xunit" Version="2.5.3" />
+    <PackageReference Include="xunit" Version="2.8.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1" />
   </ItemGroup>