(maint) Update xunit-dotnet monorepo

Author: renovate[bot]

src/Diagramming.Tests/Diagramming.Tests.csproj

@@ -19,9 +19,9 @@
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-        <PackageReference Include="xunit.analyzers" Version="1.18.0" />
-        <PackageReference Include="xunit.runner.visualstudio" Version="3.0.0">
+        <PackageReference Include="xunit" Version="2.9.3"/>
+        <PackageReference Include="xunit.analyzers" Version="1.22.0" />
+        <PackageReference Include="xunit.runner.visualstudio" Version="3.1.1">
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             <PrivateAssets>all</PrivateAssets>
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