Remove rules_groovy to fix exception (#1933)

https://buildkite.com/bazel/bazel-central-registry/builds/1913#018e7c0a-a52e-43ca-aa6d-29af5fe21167

Missed in
https://github.com/bazelbuild/continuous-integration/commit/620545fbbc8963d4361d2dc9086820d0bcd78fe7