Bump chartkick from 3.4.0 to 3.4.1

Bumps [chartkick](https://github.com/ankane/chartkick) from 3.4.0 to 3.4.1.
- [Release notes](https://github.com/ankane/chartkick/releases)
- [Changelog](https://github.com/ankane/chartkick/blob/master/CHANGELOG.md)
- [Commits](https://github.com/ankane/chartkick/compare/v3.4.0...v3.4.1)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>
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