Bump redis from 4.1.4 to 4.2.0 in /requirements (#19015)

Bumps [redis](https://github.com/redis/redis-py) from 4.1.4 to 4.2.0.
- [Release notes](https://github.com/redis/redis-py/releases)
- [Changelog](https://github.com/redis/redis-py/blob/master/CHANGES)
- [Commits](https://github.com/redis/redis-py/compare/v4.1.4...v4.2.0)

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

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

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

requirements/prod.txt

@@ -394,9 +394,9 @@ pytz==2022.1 \
 sentry_sdk==1.5.8 \
     --hash=sha256:32af1a57954576709242beb8c373b3dbde346ac6bd616921def29d68846fb8c3 \
     --hash=sha256:38fd16a92b5ef94203db3ece10e03bdaa291481dd7e00e77a148aa0302267d47
-redis==4.1.4 \
-    --hash=sha256:04629f8e42be942c4f7d1812f2094568f04c612865ad19ad3ace3005da70631a \
-    --hash=sha256:1d9a0cdf89fdd93f84261733e24f55a7bbd413a9b219fdaf56e3e728ca9a2306
+redis==4.2.0 \
+    --hash=sha256:3cbe235cea80b9c9991b397567aa2d65eb4e6fb09787f61d227ae82eb4eb50b4 \
+    --hash=sha256:6758d01dec81af191b98a35cce3402675d115456584c39b500ab485a5e386bbb
 # requests is required by PyBrowserID, amo-validator, django-mozilla-product-details, docker-compose, docker-py, nobot, pytest-base-url, pyupio, safety
 requests==2.27.1 \
     --hash=sha256:f22fa1e554c9ddfd16e6e41ac79759e17be9e492b3587efa038054674760e72d \