Unexpected buildifier error after upgrading to v6.0.0: Repository '@@bazel_features_globals' is not defined

[johanbrandhorst]

Hi! My repository (grpc-gateway) auto-updated to v6.0.0 a while back but the CI buildifier job started failing, like so:

ERROR: error loading package '@@com_github_bazelbuild_buildtools//build_proto': at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/defs.bzl:18:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/proto_toolchain.bzl:17:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/private/rules/proto_toolchain.bzl:20:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/private/rules/proto_toolchain_rule.bzl:17:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/bazel_features/features.bzl:3:6: Unable to find package for @@bazel_features_globals//:globals.bzl: The repository '@@bazel_features_globals' could not be resolved: Repository '@@bazel_features_globals' is not defined.
ERROR: /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/com_github_bazelbuild_buildtools/edit/BUILD.bazel:3:11: error loading package '@@com_github_bazelbuild_buildtools//build_proto': at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/defs.bzl:18:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/proto_toolchain.bzl:17:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/private/rules/proto_toolchain.bzl:20:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/rules_proto/proto/private/rules/proto_toolchain_rule.bzl:17:6: at /github/home/.cache/bazel/_bazel_root/13dc60d22ee138725abf21b91435297b/external/bazel_features/features.bzl:3:6: Unable to find package for @@bazel_features_globals//:globals.bzl: The repository '@@bazel_features_globals' could not be resolved: Repository '@@bazel_features_globals' is not defined. and referenced by '@@com_github_bazelbuild_buildtools//edit:edit'
ERROR: Analysis of target '//:buildifier' failed; build aborted: Analysis failed

Full log: https://github.com/grpc-ecosystem/grpc-gateway/actions/runs/9012070457/job/24760663351?pr=4266.

I made the change to WORKSPACE recommended in the release notes but I don't know how to fix this error. Any help would be appreciated. Thanks!