Bump rollbar from 2.20.2 to 2.21.0
Bump rollbar from 2.20.2 to 2.21.0

Bumps [rollbar](https://github.com/rollbar/rollbar-gem) from 2.20.2 to 2.21.0.
- [Release notes](https://github.com/rollbar/rollbar-gem/releases)
- [Changelog](https://github.com/rollbar/rollbar-gem/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rollbar/rollbar-gem/compare/v2.20.2...v2.21.0)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
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