Update MSTest.TestAdapter and 7 other dependencies

[dependabot]

Performed the following updates:

• Updated MSTest.TestAdapter to 3.8.3 in /Source/Source.projitems, /UnitTest/Test - Source/Test - Source.projitems, /UnitTest/Test.Net 5.0/Test.Net 5.0.csproj, /UnitTest/Test.Net 6.0/Test.Net 6.0.csproj, /UnitTest/Test.Net Core/Test.Net Core.csproj
• Updated MSTest.TestFramework to 3.8.3 in /Source/Source.projitems, /UnitTest/Test - Source/Test - Source.projitems, /UnitTest/Test.Net 5.0/Test.Net 5.0.csproj, /UnitTest/Test.Net 6.0/Test.Net 6.0.csproj, /UnitTest/Test.Net Core/Test.Net Core.csproj
• Updated System.Collections.Immutable to 9.0.4 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config
• Updated System.Diagnostics.DiagnosticSource to 9.0.4 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config
• Updated System.Memory to 4.6.3 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config
• Updated System.Reflection.Metadata to 9.0.4 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config
• Updated System.Runtime.CompilerServices.Unsafe to 6.1.2 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config
• Updated System.Threading.Tasks.Extensions to 4.6.3 in /UnitTest/Test.Net/Test.Net.csproj, /UnitTest/Test.Net/packages.config

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[DaanV2]

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