[maven-release-plugin] prepare release 0.21.2 #80

# to view logs

Job	Run time
maven-build / cache-dependencies (ubuntu-latest)	52s
maven-build / cache-dependencies (windows-latest)	1m 27s
maven-build / build (ubuntu-latest)	12m 38s
maven-build / build (windows-latest)	7m 48s
maven-build / github-release	3m 43s
docker-build / build	4m 37s
docker-build / scan-dockerfile-configuration / misconfiguration-scan	9s
docker-build / scan-image / scan	37s
	31m 51s

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