Bump NUnit3TestAdapter from 5.2.0 to 6.0.0

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

lang/csharp/versions.props

@@ -70,7 +70,7 @@
     <MicrosoftNETTestSdkVersion>17.13.0</MicrosoftNETTestSdkVersion>
     <NUnitVersion>3.14.0</NUnitVersion>
     <NUnitConsoleRunnerVersion>3.21.0</NUnitConsoleRunnerVersion>
-    <NUnit3TestAdapterVersion>5.2.0</NUnit3TestAdapterVersion>
+    <NUnit3TestAdapterVersion>6.0.0</NUnit3TestAdapterVersion>
     <StyleCopAnalyzersVersion>1.1.118</StyleCopAnalyzersVersion>
   </PropertyGroup>
 </Project>