Bump calendar-js from `72a427b` to `fe575fa`

Bumps [calendar-js](https://github.com/georgehrke/calendar-js) from `72a427b` to `fe575fa`.
- [Release notes](https://github.com/georgehrke/calendar-js/releases)
- [Commits](https://github.com/georgehrke/calendar-js/compare/72a427bdad090378f11a02dd1f15007c04c4fe44...fe575fa388027a658085961f46d873b49327fa28

)

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