Bump chartkick from 4.1.3 to 5.0.2

Bumps [chartkick](https://github.com/ankane/chartkick) from 4.1.3 to 5.0.2.
- [Release notes](https://github.com/ankane/chartkick/releases)
- [Changelog](https://github.com/ankane/chartkick/blob/master/CHANGELOG.md)
- [Commits](ankane/chartkick@v4.1.3...v5.0.2)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -1280,7 +1280,7 @@ GEM
     bundler-audit (0.9.1)
       bundler (>= 1.2.0, < 3)
       thor (~> 1.0)
-    chartkick (4.1.3)
+    chartkick (5.0.2)
     climate_control (0.2.0)
     cocoon (1.2.15)
     codeclimate-test-reporter (1.0.9)