The issue with strictly fixed Java 17 was resolved, but the changes were (accidentally?) rolled back in newer versions

[Legendorik]

Issue #117 is closed and versions 5.1.0-rc.4, 5.1.0-rc.5 can be built with Java 21, but in commit a9717ef these changes are basically reverted:
diff
As a result, version 5.1.1-dev.2 still requires Java 17