* stable-5.3: Prepare 5.3.9-SNAPSHOT builds JGit v5.3.8.202011260953-r Prepare 5.1.15-SNAPSHOT builds JGit v5.1.14.202011251942-r GC#deleteOrphans: log warning for deleted orphaned files GC#deleteOrphans: handle failure to list files in pack directory Ensure that GC#deleteOrphans respects pack lock Update API warning filters Remove unused imports Change-Id: I82576ad0f61cf3ff11b54691b32666c61401ad9b Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>