Eclipse JGit: Java implementation of Git 4.9.3

Bug fixes

• #536777 Delete empty refs directories
• ResolveMerger: Fix encoding with string; use bytes
• Ensure DirectoryStream is closed promptly in GC#deleteTempPacksIdx
• Retry when stale file handles on .git/config file cause read errors when the config file is replaced by another process
• #531118 Fix ssh host name handling for Jsch
• Fix that Jsch overrides the port in the URI with the one in ~/.ssh/config
• #529173 Revert handling of ssh IdentityFile to pre-4.9 behavior
• #528886 Strings#convertGlob: fix incorrect attributes pattern matching in case of brackets inside brackets
• PackInserter: Ensure objects are written at the end of the pack
• Do not ignore path deletion errors but log as warning when an attempt to remove a directory fails.
• Gerrit bug #9153 Fix LockFile semantics when running on NFS
• Honor trustFolderStats also when reading packed-refs
• Fix exception handling for opening bitmap index files when index file was deleted by gc run in another process