Bump all-contributors-cli from 6.11.2 to 6.20.0

Bumps [all-contributors-cli](https://github.com/all-contributors/all-contributors-cli) from 6.11.2 to 6.20.0.
- [Release notes](https://github.com/all-contributors/all-contributors-cli/releases)
- [Commits](all-contributors/cli@v6.11.2...v6.20.0)

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

Author: dependabot[bot]