Update xunit-dotnet monorepo to v2.8.0

Author: renovate[bot]

src/Miscellaneous/src/Problems/Coding/SeedRecordsPerBin/csharp/SolutionTest/SolutionTest.csproj

@@ -12,8 +12,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageReference Include="xunit" Version="2.7.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" />
+    <PackageReference Include="xunit" Version="2.8.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0" />
   </ItemGroup>
 
 </Project>

src/Miscellaneous/src/Problems/Coding/TruckLoadingTotalWeight/csharp/SolutionTest/SolutionTest.csproj

@@ -12,8 +12,8 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.9.0" />
-    <PackageReference Include="xunit" Version="2.7.1" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="2.5.8" />
+    <PackageReference Include="xunit" Version="2.8.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.0" />
   </ItemGroup>
 
 </Project>