Merge branch 'stable-2.14' into stable-2.15

* stable-2.14:
  Update bazlets to latest stable-2.14 to use API version 2.14.6
  Upgrade bazlets to latest stable-2.14 to use API version 2.14.5.1
  Upgrade to latest bazlets on stable-2.14

No-op merge done with `-s ours`.

Change-Id: I9596c9ff077b9bdd82f379c198f5c47f0188616a