Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Set version to 2.13.13
  WORKSPACE: Update testcontainers to version 1.10.7
  Upgrade JGit to 4.5.6.201903121547-r
  Consume JGit artifacts from Maven Central

Change-Id: Id37ac846db693629caba768366ccbabb31e60155