Bump bl from 4.0.2 to 4.1.0 in /functions (#74)

Bumps [bl](https://github.com/rvagg/bl) from 4.0.2 to 4.1.0.
- [Release notes](https://github.com/rvagg/bl/releases)
- [Commits](rvagg/bl@v4.0.2...v4.1.0)

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