chore(deps): update dependency nunit to 4.4.0

Author: renovate-bot

Directory.Packages.props

@@ -52,7 +52,7 @@
     <PackageVersion Include="MSTest.TestFramework" Version="3.10.1" />
     <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="NuGet.Protocol" Version="6.14.0" />
-    <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="5.1.0" />
     <PackageVersion Include="OneOf" Version="3.0.271" />