Merge pull request #6672 from microsoft/dependabot/nuget/get-started/quickstart/dotnet/test/NSubstitute-5.3.0

build(deps): bump NSubstitute from 5.1.0 to 5.3.0 in /get-started/quickstart/dotnet/test

get-started/quickstart/dotnet/test/KiotaPostsTests.csproj

@@ -11,7 +11,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.11.1" />
-    <PackageReference Include="NSubstitute" Version="5.1.0" />
+    <PackageReference Include="NSubstitute" Version="5.3.0" />
     <PackageReference Include="xunit" Version="2.9.2" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.8.2">
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>