Bump NUnit from 4.6.1 to 5.0.0

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 5.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/SJP.FsNotify.Tests/SJP.FsNotify.Tests.csproj

@@ -9,7 +9,7 @@
     <PackageReference Include="coverlet.collector" Version="10.1.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.10.1" />
     <PackageReference Include="Moq" Version="4.21.0" />
-    <PackageReference Include="NUnit" Version="4.6.1" />
+    <PackageReference Include="NUnit" Version="5.0.0" />
     <PackageReference Include="NUnit.Analyzers" Version="4.15.0" />
     <PackageReference Include="NUnit3TestAdapter" Version="6.3.0" />
     <PackageReference Include="System.Linq.Async" Version="7.0.1" />