Bump rollbar from 2.21.0 to 2.22.1

Bumps [rollbar](https://github.com/rollbar/rollbar-gem) from 2.21.0 to 2.22.1.
- [Release notes](https://github.com/rollbar/rollbar-gem/releases)
- [Changelog](https://github.com/rollbar/rollbar-gem/blob/master/CHANGELOG.md)
- [Commits](rollbar/rollbar-gem@v2.21.0...v2.22.1)

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

Gemfile.lock

@@ -294,7 +294,7 @@ GEM
       mime-types (>= 1.16, < 3.0)
       netrc (~> 0.7)
     rinku (2.0.6)
-    rollbar (2.21.0)
+    rollbar (2.22.1)
     ruby-pushbullet (0.1.4)
       json
       rest-client (~> 1.8.0)