Bump searchkick from 4.0.0 to 4.0.1

Bumps [searchkick](https://github.com/ankane/searchkick) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/ankane/searchkick/releases)
- [Changelog](https://github.com/ankane/searchkick/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/searchkick/compare/v4.0.0...v4.0.1)
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