Update dependency react-big-calendar to v0.33.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
react-big-calendar	0.33.5 -> 0.33.6

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Release Notes

jquense/react-big-calendar

### [`v0.33.6`](https://togithub.com/jquense/react-big-calendar/releases/v0.33.6) [Compare Source](https://togithub.com/jquense/react-big-calendar/compare/v0.33.5...v0.33.6) ##### Bug Fixes - numGroups calculation ([#​1963](https://togithub.com/jquense/react-big-calendar/issues/1963)) ([319a81c](https://togithub.com/jquense/react-big-calendar/commit/319a81c580d01621cd624c07fe76ea7f1b1c7c1d))

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