Bump engines/chartkick from `c1437a2` to `59d748c`
Bump engines/chartkick from `c1437a2` to `59d748c`

Bumps [engines/chartkick](https://github.com/ankane/chartkick) from `c1437a2` to `59d748c`.
- [Release notes](https://github.com/ankane/chartkick/releases)
- [Commits](https://github.com/ankane/chartkick/compare/c1437a23a7c7a7f7975aee35ca8e7d6f6f89f6a3...59d748c384fd51075193e81194635fe7478fc448)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
eliotsykes/real-world-rails