chore(deps): update dependency nunit3testadapter to v6 (#4004)

Co-authored-by: Renovate Bot <[email protected]>

Author: thomhurst

Directory.Packages.props

@@ -55,7 +55,7 @@
     <PackageVersion Include="NuGet.Protocol" Version="7.0.1" />
     <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.11.2" />
-    <PackageVersion Include="NUnit3TestAdapter" Version="5.2.0" />
+    <PackageVersion Include="NUnit3TestAdapter" Version="6.0.0" />
     <PackageVersion Include="OneOf" Version="3.0.271" />
     <PackageVersion Include="OneOf.SourceGenerator" Version="3.0.271" />
     <PackageVersion Include="Polly" Version="8.6.5" />