chore(deps): update xunit-dotnet monorepo to v2.8.1

Author: renovate[bot]

Tests/Tests.csproj

@@ -13,8 +13,8 @@
     <PackageReference Include="Moq" Version="4.18.3" />
     <PackageReference Include="System.IO.Abstractions" Version="17.1.1" />
     <PackageReference Include="System.IO.Abstractions.TestingHelpers" Version="17.1.1" />
-    <PackageReference Include="xunit" Version="2.4.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5">
+    <PackageReference Include="xunit" Version="2.8.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.1">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>