build(deps): bump blazer from 2.4.6 to 2.4.7 (#836)

Bumps [blazer](https://github.com/ankane/blazer) from 2.4.6 to 2.4.7.
- [Release notes](https://github.com/ankane/blazer/releases)
- [Changelog](https://github.com/ankane/blazer/blob/master/CHANGELOG.md)
- [Commits](ankane/blazer@v2.4.6...v2.4.7)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -86,7 +86,7 @@ GEM
     bindex (0.8.1)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
-    blazer (2.4.6)
+    blazer (2.4.7)
       activerecord (>= 5)
       chartkick (>= 3.2)
       railties (>= 5)