Update xunit-dotnet monorepo to v4

Author: renovate[bot]

test/FactorioTools.Test/FactorioTools.Test.csproj

@@ -48,8 +48,8 @@
     -->
     <PackageReference Include="Verify.DiffPlex" Version="3.3.1" />
     <PackageReference Include="Verify.XunitV3" Version="32.0.0" />
-    <PackageReference Include="xunit.v3" Version="3.2.2" />
-    <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5">
+    <PackageReference Include="xunit.v3" Version="4.0.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="4.0.0">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>