Jean-Luc Makiola e5c87015fa build: target Java 21 (LTS) instead of Java 25 ...

maven.compiler.source/target were set to 25, but the newest language feature
actually used is List.getFirst() (SequencedCollection, Java 21). On a JDK 17 or
21 the project would not compile at all.

- Use maven.compiler.release=21 instead of the source/target pair
- README: update prerequisites, tech stack and test count
- .gitignore: ignore the Nextcloud sync file and release/*.jar

2026-07-14 12:37:45 +02:00

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