Bump bullet from 5.7.5 to 5.7.6 (#8947)

Bumps [bullet](https://github.com/flyerhzm/bullet) from 5.7.5 to 5.7.6.
- [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/5.7.5...5.7.6)

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

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
     brakeman (4.3.1)
     browser (2.5.3)
     builder (3.2.3)
-    bullet (5.7.5)
+    bullet (5.7.6)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11.0)
     bundler-audit (0.6.0)