Use garbage collector zgc #621

Job	Run time
Checkstyle	2m 51s
Markdown	9s
Modernizer	1m 38s
OpenRewrite	2m 50s
CHANGELOG.md	8s
CHANGELOG.md - only unreleased touched	15s
Database tests	3m 24s
GUI tests	2m 39s
Unit tests	6m 54s
Code coverage	32s
Validate Gradle Wrapper	8s
Find merge conflicts	4s
Source branch is other than "main"	1s
Validate requiremenet coverage	1m 1s
upload-pr-number	3s
	22m 37s

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