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] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -50,7 +50,7 @@ GEM
       erubi (~> 1.11)
       rails-dom-testing (~> 2.2)
       rails-html-sanitizer (~> 1.6)
-    active_model_serializers (0.10.14)
+    active_model_serializers (0.10.15)
       actionpack (>= 4.1)
       activemodel (>= 4.1)
       case_transform (>= 0.2)
@@ -134,7 +134,7 @@ GEM
     jsonapi-renderer (0.2.2)
     jwt (2.9.3)
       base64
-    logger (1.6.1)
+    logger (1.6.2)
     loofah (2.23.1)
       crass (~> 1.0.2)
       nokogiri (>= 1.12.0)
@@ -145,9 +145,9 @@ GEM
       net-smtp
     marcel (1.0.4)
     mini_mime (1.1.5)
-    minitest (5.25.1)
+    minitest (5.25.2)
     msgpack (1.7.5)
-    mutex_m (0.2.0)
+    mutex_m (0.3.0)
     net-imap (0.5.1)
       date
       net-protocol
@@ -219,7 +219,7 @@ GEM
       psych (>= 4.0.0)
     reline (0.5.11)
       io-console (~> 0.5)
-    securerandom (0.3.2)
+    securerandom (0.4.0)
     sprockets (4.2.1)
       concurrent-ruby (~> 1.0)
       rack (>= 2.2.4, < 4)