Bump redis[hiredis] from 4.6.0 to 7.1.0 in /reference-apps/fastapi (#4)

Bumps [redis[hiredis]](https://github.com/redis/redis-py) from 4.6.0 to 7.1.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v4.6.0...v7.1.0)

---
updated-dependencies:
- dependency-name: redis[hiredis]
  dependency-version: 7.1.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

reference-apps/fastapi/requirements.txt

@@ -15,7 +15,7 @@ motor==3.7.1
 pymongo==4.15.3
 
 # Redis and Caching
-redis[hiredis]==4.6.0  # fastapi-cache2 0.2.2 requires redis<5.0.0
+redis[hiredis]==7.1.0  # fastapi-cache2 0.2.2 requires redis<5.0.0
 fastapi-cache2[redis]==0.2.2  # Response caching
 
 # RabbitMQ