Update dependency NUnit3TestAdapter to v6

Author: dependencyupdates[bot]

src/Directory.Packages.props

@@ -53,7 +53,7 @@
     <PackageVersion Include="NuGet.Versioning" Version="6.14.0" />
     <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="OpenTelemetry.Exporter.Console" Version="1.9.0" />
     <PackageVersion Include="OpenTelemetry.Exporter.OpenTelemetryProtocol" Version="1.9.0" />
     <PackageVersion Include="OpenTelemetry.Extensions.Hosting" Version="1.9.0" />