build: Remove buildifier dep

[hofbi]

Buildifier is already executed in

rules-template/.pre-commit-config.yaml

Lines 29 to 33 in 534c9bf

	- repo: https://github.com/keith/pre-commit-buildifier
	rev: 8.2.1
	hooks:
	- id: buildifier
	- id: buildifier-lint

both locally and in CI, so this is redundant.