Bump redis from 4.7.1 to 4.8.0

Bumps [redis](https://github.com/redis/redis-rb) from 4.7.1 to 4.8.0.
- [Release notes](https://github.com/redis/redis-rb/releases)
- [Changelog](https://github.com/redis/redis-rb/blob/master/CHANGELOG.md)
- [Commits](https://github.com/redis/redis-rb/compare/v4.7.1...v4.8.0)

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

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

Gemfile

@@ -30,7 +30,7 @@ gem "stimulus-rails"
 gem "jbuilder"
 
 # Use Redis adapter to run Action Cable in production
-gem "redis", "~> 4.7"
+gem "redis", "~> 4.8"
 
 # Use Kredis to get higher-level data types in Redis [https://github.com/rails/kredis]
 # gem "kredis"