tck: Use specific assertj version for junit4-runpath projects
We don't want to rely on the version of assertj in biz.aQute.junit.
# -include for testing with junit 3/4 with JUnit on classpath
--buildpath.osgi.tck: biz.aQute.junit;version=latest
+-runpath.osgi.tck: assertj-core;version=latest
+
+-buildpath.osgi.tck: assertj-core;version=latest,\
+ biz.aQute.junit;version=latest
-tester: biz.aQute.junit;version=latest
