chore(deps): update xunit-dotnet monorepo

Author: renovate[bot]

src/ReactiveMarbles.PropertyChanged.Tests/ReactiveMarbles.PropertyChanged.Tests.csproj

@@ -16,8 +16,8 @@
 
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+    <PackageReference Include="xunit" Version="2.9.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2" />
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