[UPDATE] Update redis requirement from <8.0.0,>=6.4.0 to >=7.4.0,<8.0.0

Updates the requirements on [redis](https://github.com/redis/redis-py) to permit the latest version.
- [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/v6.4.0...v7.4.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 7.4.0
  dependency-type: direct:production
...

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

pyproject.toml

@@ -44,7 +44,7 @@ dependencies = [
     "django-honeypot>=1.3.0,<2",
     "pydantic-extra-types>=2.11.1,<3.0.0",
     "ical>=11.1.0,<14.0.0",
-    "redis[hiredis]>=6.4.0,<8.0.0",
+    "redis[hiredis]>=7.4.0,<8.0.0",
     "environs[django]>=15.0.1,<16.0.0",
     "requests>=2.32.5,<3.0.0",
     "honcho>=2.0.0",