chore: remove junit3 references #362

Job	Run time
Verify / setup-maven-version	2s
Verify / ubuntu-latest jdk-17-zulu 4.0.0-beta-3	2m 18s
Verify / ${{ matrix.os }} jdk-${{ matrix.jdk }}-${{ matrix.distribution }} ${{ matrix.maven }}	0s
	2m 20s

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