[spec] ubuntu build .NET 8 for tests set

Author: i4004

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
         run: dotnet build ${{ matrix.solution }} --no-restore -c Release
 
       - name: Perform Unit Testing
-        run: dotnet test ${{ matrix.solution }} --no-build -c Release --filter "TestCategory != Integration & TestCategory != ${{ matrix.tests-exclude-category }}" --verbosity normal
+        run: dotnet test ${{ matrix.solution }} --no-build -c Release --framework net8.0 --filter "TestCategory != Integration & TestCategory != ${{ matrix.tests-exclude-category }}" --verbosity normal
 
       - name: Create Packages
         run: dotnet pack ${{ matrix.solution }} --no-build -c Release -o ./publish