Fix incompatible_autoload_externally BCR failure

[adam-singer]

Releasing bazel_jar_jar fails with

Command was successful with the following flags:
--
--incompatible_config_setting_private_default_visibility
--incompatible_disable_starlark_host_transitions
--incompatible_disable_native_repo_rules
--incompatible_strict_action_env
 
Migration is needed for the following flags:
--incompatible_autoload_externally=
bazel build failed with exit code 73
 
ERROR: BCR presubmit failed with incompatible flags.
Please consider migrating your project for the incompatible flags.
You can bypass this test by commenting '@bazel-io skip_check incompatible_flags' in the PR or override the list of flags in your presubmit.yml file.
See more details at https://github.com/bazelbuild/bazel-central-registry/blob/main/docs/README.md#testing-incompatible-flags
🚨 Error: The command exited with status 73
user command error: exit status 73

https://chromium.googlesource.com/external/github.com/bazelbuild/bazel-central-registry/+/HEAD/docs/README.md