chore(deps)(deps): bump redis from 7.1.1 to 7.4.0 in /backend

Bumps [redis](https://github.com/redis/redis-py) from 7.1.1 to 7.4.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v7.1.1...v7.4.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 7.4.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]