Bump chartkick from 5.0.3 to 5.0.4 (#4026)

Bumps [chartkick](https://github.com/ankane/chartkick) from 5.0.3 to 5.0.4.
- [Changelog](https://github.com/ankane/chartkick/blob/master/CHANGELOG.md)
- [Commits](ankane/chartkick@v5.0.3...v5.0.4)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -139,7 +139,7 @@ GEM
       regexp_parser (>= 1.5, < 3.0)
       xpath (~> 3.2)
     cbor (0.5.9.6)
-    chartkick (5.0.3)
+    chartkick (5.0.4)
     choice (0.2.0)
     chunky_png (1.4.0)
     clearance (2.6.1)