Bump aeon-php/calendar from 0.16.3 to 0.16.4 (#82)

Bumps [aeon-php/calendar](https://github.com/aeon-php/calendar) from 0.16.3 to 0.16.4.
- [Release notes](https://github.com/aeon-php/calendar/releases)
- [Changelog](https://github.com/aeon-php/calendar/blob/1.x/CHANGELOG.md)
- [Commits](aeon-php/calendar@0.16.3...0.16.4)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>