Bump NUnit from 4.5.1 to 4.6.0 (#1199)

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="System.Memory" Version="4.6.3" />
     <PackageVersion Include="System.Text.Json" Version="10.0.6" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
-    <PackageVersion Include="NUnit" Version="4.5.1" />
+    <PackageVersion Include="NUnit" Version="4.6.0" />
     <PackageVersion Include="FsUnit" Version="7.1.1" />
     <PackageVersion Include="FSharp.Data" Version="8.1.10" />
     <PackageVersion Include="NUnit3TestAdapter" Version="6.2.0" />