Merge branch 'stable-5.13' into stable-6.0

* stable-5.13:
  GC: Close File.lines stream

Change-Id: Ib473750e5a3ad3d74b0cb41f25052890f50a975c

diff --cc org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/GC.java
Simple merge