Bump redis from 4.2.1 to 4.2.2
Bump redis from 4.2.1 to 4.2.2

Bumps [redis](https://github.com/redis/redis-rb) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/redis/redis-rb/releases)
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/redis-rb/compare/v4.2.1...v4.2.2)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
sue445/twittodon,sue445/twittodon