Bump react-calendar from 3.9.0 to 4.8.0 (#7)

Bumps [react-calendar](https://github.com/wojtekmaj/react-calendar/tree/HEAD/packages/react-calendar) from 3.9.0 to 4.8.0.
- [Release notes](https://github.com/wojtekmaj/react-calendar/releases)
- [Commits](https://github.com/wojtekmaj/react-calendar/commits/v4.8.0/packages/react-calendar)

---
updated-dependencies:
- dependency-name: react-calendar
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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