Bump bugsnag from 6.14.0 to 6.15.0 (#1763)

Bumps [bugsnag](https://github.com/bugsnag/bugsnag-ruby) from 6.14.0 to 6.15.0.
- [Release notes](https://github.com/bugsnag/bugsnag-ruby/releases)
- [Changelog](https://github.com/bugsnag/bugsnag-ruby/blob/master/CHANGELOG.md)
- [Commits](bugsnag/bugsnag-ruby@v6.14.0...v6.15.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

Gemfile.lock

@@ -83,7 +83,7 @@ GEM
     bootstrap-daterangepicker-rails (3.0.4)
       railties (>= 4.0)
     bootstrap-select-rails (1.13.8)
-    bugsnag (6.14.0)
+    bugsnag (6.15.0)
       concurrent-ruby (~> 1.0)
     builder (3.2.4)
     capistrano (3.14.1)