Merge branch 'stable-3.0'

* stable-3.0:
  Upgrade bazlets to latest stable-3.0
  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: Ia8d56ea27b3e7aff8842848369fe03cda3e67912