Bump bullet from 6.1.2 to 6.1.3

Bumps [bullet](https://github.com/flyerhzm/bullet) from 6.1.2 to 6.1.3.
- [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/6.1.2...6.1.3)

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

Gemfile.lock

@@ -85,7 +85,7 @@ GEM
       autoprefixer-rails (>= 5.2.1)
       sassc (>= 2.0.0)
     builder (3.2.4)
-    bullet (6.1.2)
+    bullet (6.1.3)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11)
     byebug (11.1.3)
@@ -99,7 +99,7 @@ GEM
       coffee-script-source
       execjs
     coffee-script-source (1.12.2)
-    concurrent-ruby (1.1.7)
+    concurrent-ruby (1.1.8)
     crass (1.0.6)
     database_cleaner (1.8.5)
     diff-lcs (1.4.4)
@@ -160,7 +160,7 @@ GEM
     mimemagic (0.3.5)
     mini_mime (1.0.2)
     mini_portile2 (2.5.0)
-    minitest (5.14.2)
+    minitest (5.14.3)
     minitest-stub-const (0.6)
     mocha (1.12.0)
     mysql2 (0.5.3)
@@ -310,7 +310,7 @@ GEM
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)
     unicode-display_width (1.7.0)
-    uniform_notifier (1.13.0)
+    uniform_notifier (1.13.2)
     websocket-driver (0.7.3)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)