chore(deps): Bump NSubstitute from 4.3.0 to 4.4.0 in /packages/@jsii/dotnet-runtime-test/test (#3653)

Bumps NSubstitute from 4.3.0 to 4.4.0.


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packages/@jsii/Directory.Build.targets

@@ -11,7 +11,7 @@
     <PackageReference Update="Microsoft.CodeQuality.Analyzers" Version="3.3.2" />
 
     <PackageReference Update="Microsoft.NET.Test.Sdk" Version="17.2.0" />
-    <PackageReference Update="NSubstitute" Version="4.3.0" />
+    <PackageReference Update="NSubstitute" Version="4.4.0" />
     <PackageReference Update="xunit" Version="2.4.1" />
     <PackageReference Update="xunit.runner.visualstudio" Version="2.4.5" />
     <PackageReference Update="XunitXml.TestLogger" Version="3.0.70" />