Bump active_model_serializers from 0.10.14 to 0.10.15

Bumps [active_model_serializers](https://github.com/rails-api/active_model_serializers) from 0.10.14 to 0.10.15.
- [Release notes](https://github.com/rails-api/active_model_serializers/releases)
- [Changelog](https://github.com/rails-api/active_model_serializers/blob/v0.10.15/CHANGELOG.md)
- [Commits](rails-api/active_model_serializers@v0.10.14...v0.10.15)

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

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

Gemfile.lock

@@ -46,7 +46,7 @@ GEM
       erubi (~> 1.4)
       rails-dom-testing (~> 2.0)
       rails-html-sanitizer (~> 1.1, >= 1.2.0)
-    active_model_serializers (0.10.14)
+    active_model_serializers (0.10.15)
       actionpack (>= 4.1)
       activemodel (>= 4.1)
       case_transform (>= 0.2)