Bump bullet from 6.1.3 to 6.1.4

Bumps [bullet](https://github.com/flyerhzm/bullet) from 6.1.3 to 6.1.4.
- [Release notes](https://github.com/flyerhzm/bullet/releases)
- [Changelog](https://github.com/flyerhzm/bullet/blob/master/CHANGELOG.md)
- [Commits](https://github.com/flyerhzm/bullet/compare/6.1.3...6.1.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Gemfile.lock

@@ -99,7 +99,7 @@ GEM
       actionpack (>= 5.2)
       activemodel (>= 5.2)
     builder (3.2.4)
-    bullet (6.1.3)
+    bullet (6.1.4)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11)
     byebug (11.1.3)
@@ -334,7 +334,7 @@ GEM
     mini_magick (4.11.0)
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
-    minitest (5.14.3)
+    minitest (5.14.4)
     moneta (1.0.0)
     multi_json (1.15.0)
     multi_xml (0.6.0)
@@ -569,7 +569,7 @@ GEM
     unicorn (5.8.0)
       kgio (~> 2.6)
       raindrops (~> 0.7)
-    uniform_notifier (1.13.2)
+    uniform_notifier (1.14.0)
     validate_url (1.0.13)
       activemodel (>= 3.0.0)
       public_suffix