fixes invalid rule from hyphen

[ekohilas]

Summary

When using add_rule.py, it produces the following line in codes.rs

        (Flake8Async, "102") => (RuleGroup::Stable, rules::flake8-async::rules::BlockingOsCallInAsyncFunction),

Causing a syntax error.

This PR resolves that issue so that the script can be used again.

Test Plan

Tested manually in new rule creation

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

✅ ecosystem check detected no linter changes.

Formatter (stable)

✅ ecosystem check detected no format changes.

Formatter (preview)

✅ ecosystem check detected no format changes.

[charliermarsh]

Thanks!

[charliermarsh]

I think there's high likelihood that there are other bugs and limitations in those scripts; they're not tested continuously so they tend to go stale.