message: Upgrade bazel to 0.29.1.
diff: @@ -29,7 +29,7 @@ if [[ -n "${KOKORO_ROOT}" ]]; then
  rm -f ~/.bazelrc
  # TODO(b/131821833) Use the latest version of Bazel.
  - use_bazel.sh 0.28.1
  + use_bazel.sh 0.29.1
  if [[ "${PLATFORM}" == 'darwin' ]]; then
  export DEVELOPER_DIR="/Applications/Xcode_${XCODE_VERSION}.app/Contents/Developer"
  