Draft: build(mvn): updated Java to version 21 LTS
java language level, compiled classes version and the JRE used during CI were all updated to 21
DEPLOYMENT NOTE: compiled classes will not run on a JRE older than 21
Edited by Martin Kuba
java language level, compiled classes version and the JRE used during CI were all updated to 21
DEPLOYMENT NOTE: compiled classes will not run on a JRE older than 21