Bump calendar-js from `c1bf1a2` to `cf6d118`

Bumps [calendar-js](https://github.com/georgehrke/calendar-js) from `c1bf1a2` to `cf6d118`.
- [Release notes](https://github.com/georgehrke/calendar-js/releases)
- [Commits](https://github.com/georgehrke/calendar-js/compare/c1bf1a23b0422416390c58aede640f280cdc1c78...cf6d118719d8a915fa468a2370dc3941232bb2fa

)

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