Merge branch 'stable-2.16' into stable-3.0

* stable-2.16:
  Upgrade bazlets to latest stable-2.16
  Upgrade bazlets to latest stable-2.15
  Bump required bazel version to 1.0.0rc2
  Upgrade bazlets to latest stable-2.14
  Upgrade testcontainers to 1.12.1

Change-Id: I0113a1bcf6f4ec7a3b086e87debacfa2cfdb87b2