Update Bazel to latest version
Update Bazel to latest version

Included changes:

  - 8345b792b755a33c4035b2d1dc46c5be05201f58 The great Skylark -> Starlark class migration:

BAZEL_VERSION_REV_ID: 8345b792b755a33c4035b2d1dc46c5be05201f58
Change-Id: I6968a637fec499ba3195732eee1cdfa94465ace4

google/copybara,google/copybara,google/copybara