build(deps): bump redis from 4.4.0 to 4.4.2 in /backend (#1714)

Bumps [redis](https://github.com/redis/redis-py) from 4.4.0 to 4.4.2.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.4.0...v4.4.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/requirements.txt

@@ -8,6 +8,6 @@ google-cloud-storage==2.7.0
 gunicorn==20.1.0
 python-dateutil==2.8.2
 pytoml==0.1.21
-redis==4.4.0
+redis==4.4.2
 swagger-ui-bundle==0.0.9
 zstandard==0.19.0