Update dependency bazelbuild/buildtools to latest version
Update dependency bazelbuild/buildtools to latest version

Included changes:

  - e6efbf6df90bec363c3cbd564b72be6c8a309f14 Remove laurentlb from CODEOWNERS (#912)

BAZEL_BUILDTOOLS_VERSION_REV_ID: e6efbf6df90bec363c3cbd564b72be6c8a309f14
Change-Id: I0bbef49808093d7e7943ac7a44fb9cf6bcc9bfdc

google/copybara,google/copybara,google/copybara