Bump commons from d8a1d0a to 187770e

Bumps [commons](https://github.com/heroku/buildpacks-ruby) from `d8a1d0a` to `187770e`.
- [Release notes](https://github.com/heroku/buildpacks-ruby/releases)
- [Commits](heroku/buildpacks-ruby@d8a1d0a...187770e)

---
updated-dependencies:
- dependency-name: commons
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>