Bump redis from 5.0.8 to 5.1.1

Bumps [redis](https://github.com/redis/redis-py) from 5.0.8 to 5.1.1.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](redis/redis-py@v5.0.8...v5.1.1)

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

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

requirements-dev.txt

@@ -661,7 +661,7 @@ pyyaml==6.0.1
     #   responses
 readme-renderer==43.0
     # via twine
-redis==5.0.8
+redis==5.1.1
     # via
     #   -r requirements-tests.txt
     #   celery

requirements-docs.txt

@@ -678,7 +678,7 @@ pyyaml==6.0.1
     #   jsonschema-path
     #   moto
     #   responses
-redis==5.0.8
+redis==5.1.1
     # via
     #   -r requirements-docs.in
     #   -r requirements-tests.txt

requirements-tests.txt

@@ -544,7 +544,7 @@ pyyaml==6.0.1
     #   jsonschema-path
     #   moto
     #   responses
-redis==5.0.8
+redis==5.1.1
     # via
     #   -r requirements.txt
     #   celery

requirements.txt

@@ -301,7 +301,7 @@ pyyaml==6.0.1
     # via
     #   -r requirements.in
     #   cloudflare
-redis==5.0.8
+redis==5.1.1
     # via
     #   -r requirements.in
     #   celery