build(deps): bump redis in /mpcontribs-serverless/dependencies

Bumps [redis](https://github.com/redis/redis-py) from 4.2.1 to 4.2.2.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.2.1...v4.2.2)

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

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

mpcontribs-serverless/dependencies/requirements.txt

@@ -1,3 +1,3 @@
 mpcontribs-client==4.2.10
 ddtrace==0.60.1
-redis==4.2.1
+redis==4.2.2