Bump NUnit.Analyzers from 3.8.0 to 3.9.0

Bumps [NUnit.Analyzers](https://github.com/nunit/nunit.analyzers) from 3.8.0 to 3.9.0.
- [Release notes](https://github.com/nunit/nunit.analyzers/releases)
- [Changelog](https://github.com/nunit/nunit.analyzers/blob/master/CHANGES.txt)
- [Commits](nunit/nunit.analyzers@3.8.0...3.9.0)

---
updated-dependencies:
- dependency-name: NUnit.Analyzers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Directory.Packages.props

@@ -27,7 +27,7 @@
     <PackageVersion Include="Microsoft.Build" Version="17.3.2" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.7.2" />
     <PackageVersion Include="MSBuild.StructuredLogger" Version="2.1.858" />
-    <PackageVersion Include="NUnit.Analyzers" Version="3.8.0" />
+    <PackageVersion Include="NUnit.Analyzers" Version="3.9.0" />
     <PackageVersion Include="NUnit" Version="3.13.3" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />
     <PackageVersion Include="PolySharp" Version="1.13.2" />