Bump bl from 1.2.2 to 1.2.3 in /nflow-explorer (#413)

Bumps [bl](https://github.com/rvagg/bl) from 1.2.2 to 1.2.3.
- [Release notes](https://github.com/rvagg/bl/releases)
- [Commits](rvagg/bl@v1.2.2...v1.2.3)

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