Bump chartkick from 5.0.6 to 5.0.7

Bumps [chartkick](https://github.com/ankane/chartkick) from 5.0.6 to 5.0.7.
- [Changelog](https://github.com/ankane/chartkick/blob/master/CHANGELOG.md)
- [Commits](ankane/chartkick@v5.0.6...v5.0.7)

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

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

Gemfile.lock

@@ -109,7 +109,7 @@ GEM
       rack-test (>= 0.6.3)
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
-    chartkick (5.0.6)
+    chartkick (5.0.7)
     childprocess (5.0.0)
     choice (0.2.0)
     chronic (0.10.2)