Bump redis from 3.1.1 to 3.1.2
Bump redis from 3.1.1 to 3.1.2

Bumps [redis](https://github.com/NodeRedis/node-redis) from 3.1.1 to 3.1.2.
- [Release notes](https://github.com/NodeRedis/node-redis/releases)
- [Changelog](https://github.com/NodeRedis/node-redis/blob/master/CHANGELOG.md)
- [Commits](https://github.com/NodeRedis/node-redis/compare/v3.1.1...v3.1.2)

---
updated-dependencies:
- dependency-name: redis
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
schul-cloud/schulcloud-server,schul-cloud/schulcloud-server,schul-cloud/schulcloud-server