JUnit import packages are missing version bound in org.eclipse.cdt.core.tests

[DangMinhTam382]

Describe the bug
JUnit import packages in org.eclipse.cdt.core.tests are missing maximum version bound, making org.eclipse.cdt.core.testplugin.util.BaseTestCase5.class always run test on latest JUnit version in local environment causing JUnit runner mismatch when running a derived test class with a lower JUnit version

To Reproduce
Steps to reproduce the behavior:

1. Make sure Local environment has 2 JUnit version (5 and 6)
2. Run a test class that derived from org.eclipse.cdt.core.testplugin.util.BaseTestCase5.class with JUnit 5 (Ex: CMakeBuildConfigurationTests.java)
3. Test case fails due to BaseTestCase5.class didn't setup correctly (@BeforeEach setupBase(TestInfo) method not called)

Expected behavior
@beforeeach setupBase(TestInfo) is called.

Version Information (please complete the following information):

• OS and OS Version/extra details: Windows
• Eclipse Version from Help: 2026-06 (4.40.0). Build id: 20260604-0653
• CDT Version from Help: 12.5.0

Additional context
Adding maximum version bound (6.0.0) for JUnit related imported plugins in org.eclipse.cdt.core.tests fix this issue