Merge branch 'origin/feature/UIMA-6374-Create-CAS-de--serialization-test-suite' into feature/UIMA-6266-Clean-JSON-Wire-Format-for-CAS

* origin/feature/UIMA-6374-Create-CAS-de--serialization-test-suite:
  [UIMA-6374] Create CAS (de)serialization test suite
  [UIMA-6372] Upgrade from JUnit 3 to JUnit 4 to JUnit 5

# Conflicts:
#	uimaj-core/src/test/java/org/apache/uima/cas/serdes/datasuites/MultiFeatureRandomCasDataSuite.java