Merge branch 'stable-5.3' into stable-5.4

* stable-5.3:
  Prepare 5.3.4-SNAPSHOT builds
  JGit v5.3.3.201908210735-r
  Add missing @since tag on FileTreeIterator#getLastModifiedInstant
  Prepare 5.1.10-SNAPSHOT builds
  JGit v5.1.9.201908210455-r
  Avoid sign extension when comparing mtime with Instant#getEpochSecond
  Fix deprecation in DirCache caused by Instant based DirCacheEntry

Change-Id: Ic3c8d3adf522b73f87c713538a14697eb690f508
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCache.java
Simple merge

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/dircache/DirCacheEntry.java
Simple merge