v8.0.3 added rules_shell dependency

[johanbrandhorst]

Hi! I'm the maintainer of the grpc-gateway. An automated dependency update to bazel buildtools v8.0.3 broke our bazel buildifier job. The error looks like this:

bazel run //:buildifier && git diff --exit-code
Computing main repo mapping: 
Loading: 
Loading: 0 packages loaded
Analyzing: target //:buildifier (0 packages loaded, 0 targets configured)
Analyzing: target //:buildifier (0 packages loaded, 0 targets configured)

ERROR: error loading package '@@+non_module_deps+com_github_bazelbuild_buildtools//buildifier': Unable to find package for @@[unknown repo 'rules_shell' requested from @@+non_module_deps+com_github_bazelbuild_buildtools]//shell:sh_test.bzl: The repository '@@[unknown repo 'rules_shell' requested from @@+non_module_deps+com_github_bazelbuild_buildtools]' could not be resolved: No repository visible as '@rules_shell' from repository '@@+non_module_deps+com_github_bazelbuild_buildtools'.
ERROR: /__w/grpc-gateway/grpc-gateway/BUILD.bazel:8:11: every rule of type _buildifier implicitly depends upon the target '@@+non_module_deps+com_github_bazelbuild_buildtools//buildifier:buildifier', but this target could not be found because of: error loading package '@@+non_module_deps+com_github_bazelbuild_buildtools//buildifier': Unable to find package for @@[unknown repo 'rules_shell' requested from @@+non_module_deps+com_github_bazelbuild_buildtools]//shell:sh_test.bzl: The repository '@@[unknown repo 'rules_shell' requested from @@+non_module_deps+com_github_bazelbuild_buildtools]' could not be resolved: No repository visible as '@rules_shell' from repository '@@+non_module_deps+com_github_bazelbuild_buildtools'.
ERROR: Analysis of target '//:buildifier' failed; build aborted: Analysis failed

I think the significant part is

unknown repo 'rules_shell' requested from non_module_deps com_github_bazelbuild_buildtools

Full build log.

Nothing in the release notes mentions this new dependency. Was it added intentionally? How are users supposed to depend on the buildtools now?