chore(deps): update dependency nunit to 4.4.0

Author: renovate[bot]

tests/System.IO.Abstractions.Extensions.Tests/System.IO.Abstractions.Extensions.Tests.csproj

@@ -13,7 +13,7 @@
 
 	<ItemGroup>
 		<PackageReference Include="TestableIO.System.IO.Abstractions.Wrappers" Version="22.0.14" />
-		<PackageReference Include="NUnit" Version="4.3.2" />
+		<PackageReference Include="NUnit" Version="4.4.0" />
 		<PackageReference Include="NUnit.Analyzers" Version="4.9.2">
 		  <PrivateAssets>all</PrivateAssets>
 		  <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>