Bump the test-dependencies group with 1 update (#1025)

Bumps NUnit3TestAdapter from 5.2.0 to 6.0.1

---
updated-dependencies:
- dependency-name: NUnit3TestAdapter
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: test-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

NGitLab.Tests/NGitLab.Tests.csproj

@@ -19,7 +19,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="NUnit3TestAdapter" Version="5.2.0" />
+    <PackageReference Include="NUnit3TestAdapter" Version="6.0.1" />
     <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="Polly" Version="8.6.5" />
     <PackageReference Include="System.Text.Json" Version="8.0.5" />