Commit 979508a7f3 removed the JUnit 4
dependency from all modules except spring-test. Unfortunately, the
@Inject TCK tests (SpringAtInjectTckTests) are still based on JUnit 3.
Thus, that commit accidentally excluded those tests from the build.
This commit includes SpringAtInjectTckTests in the build again by
introducing a test runtime dependency on the JUnit Vintage TestEngine
in spring-context.
See gh-23451