Update Bazel to latest version
Update Bazel to latest version

Included changes:

  - 20c276801ee66a73b73facd5c75ae8b38eabb00d Fix getListener documentation
  - 793964e8e4268629d82fabbd08bf1a7718afa301 bazel syntax: improve assignment arity mismatch errors

BAZEL_VERSION_REV_ID: 20c276801ee66a73b73facd5c75ae8b38eabb00d
Change-Id: I87a00f160adca04d2ff78a7f5dbf68a67ff82715

google/copybara,google/copybara,google/copybara