Disable parallel tests for different platforms in .NET 9.0

Author: odinserj

Diff for: psake-project.ps1

@@ -23,8 +23,8 @@ Task Test -Depends Merge -Description "Run unit and integration tests against me
     # support halting the whole execution pipeline when "dotnet test" command fails due to a failed test,
     # silently allowing build process to continue its execution even with failed tests.
     Exec { dotnet test -c Release --no-build "tests\Hangfire.Core.Tests" }
-    Exec { dotnet test -c Release --no-build "tests\Hangfire.SqlServer.Tests" }
-    Exec { dotnet test -c Release --no-build "tests\Hangfire.SqlServer.Msmq.Tests" }
+    Exec { dotnet test -c Release --no-build -p:TestTfmsInParallel=false "tests\Hangfire.SqlServer.Tests" }
+    Exec { dotnet test -c Release --no-build -p:TestTfmsInParallel=false "tests\Hangfire.SqlServer.Msmq.Tests" }
 }
 
 Task Collect -Depends Test -Description "Copy all artifacts to the build folder." {