Bump NUnit from 3.14.0 to 4.5.1

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.5.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Directory.Packages.props

@@ -19,7 +19,7 @@
     <PackageVersion Include="System.Memory" Version="4.5.5" />
     <PackageVersion Include="System.Text.Json" Version="8.0.5" />
     <PackageVersion Include="Microsoft.CodeAnalysis.CSharp" Version="4.7.0" />
-    <PackageVersion Include="NUnit" Version="3.14.0" />
+    <PackageVersion Include="NUnit" Version="4.5.1" />
     <PackageVersion Include="FsUnit" Version="5.6.0" />
     <PackageVersion Include="FSharp.Data" Version="6.3.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.5.0" />