Bump NSubstitute from 5.3.0 to 6.0.0#21

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mainsystemslibrarian/postquantum-aspnetcore:mainfrom

dependabot/nuget/tests/PostQuantum.AspNetCore.Tests/NSubstitute-6.0.0systemslibrarian/postquantum-aspnetcore:dependabot/nuget/tests/PostQuantum.AspNetCore.Tests/NSubstitute-6.0.0Copy head branch name to clipboard