(deps): Bump NUnit from 4.3.2 to 4.4.0

---
updated-dependencies:
- dependency-name: NUnit
  dependency-version: 4.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

src/Directory.Packages.props

@@ -33,7 +33,7 @@
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.0.0" />
     <PackageVersion Include="Microsoft.Win32.Registry" Version="6.0.0-preview.5.21301.5" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
-    <PackageVersion Include="NUnit" Version="4.3.2" />
+    <PackageVersion Include="NUnit" Version="4.4.0" />
     <PackageVersion Include="NUnit.Analyzers" Version="4.10.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="5.0.0" />
     <PackageVersion Include="Shouldly" Version="4.3.0" />