chore(deps): bump bl from 6.0.19 to 6.0.20

Bumps [bl](https://github.com/rvagg/bl) from 6.0.19 to 6.0.20.
- [Release notes](https://github.com/rvagg/bl/releases)
- [Changelog](https://github.com/rvagg/bl/blob/master/CHANGELOG.md)
- [Commits](rvagg/bl@v6.0.19...v6.0.20)

---
updated-dependencies:
- dependency-name: bl
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]