Bump bugsnag from 6.26.4 to 6.28.0

Bumps [bugsnag](https://github.com/bugsnag/bugsnag-ruby) from 6.26.4 to 6.28.0.
- [Release notes](https://github.com/bugsnag/bugsnag-ruby/releases)
- [Changelog](https://github.com/bugsnag/bugsnag-ruby/blob/master/CHANGELOG.md)
- [Commits](https://github.com/bugsnag/bugsnag-ruby/compare/v6.26.4...v6.28.0)

---
updated-dependencies:
- dependency-name: bugsnag
  dependency-version: 6.28.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -200,7 +200,7 @@ GEM
     bindex (0.8.1)
     bootsnap (1.18.3)
       msgpack (~> 1.2)
-    bugsnag (6.26.4)
+    bugsnag (6.28.0)
       concurrent-ruby (~> 1.0)
     builder (3.3.0)
     bullet (8.0.8)