Merge branch 'stable-6.3' into stable-6.4

* stable-6.3:
  Add verification in GcKeepFilesTest that bitmaps are generated
  Express the explicit intention of creating bitmaps in GC
  GC: prune all packfiles after the loosen phase
  Prepare 5.13.3-SNAPSHOT builds
  JGit v5.13.2.202306221912-r

Change-Id: I0bccc36d9cc9a36f1be9b1562df35ce3a0e95eee

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/pack/PackWriter.java
Simple merge