Update redis requirement from ==7.4.* to ==8.0.* (#6226)

* Update redis requirement from ==7.4.* to ==8.0.*

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/v7.4.0...v8.0.0)

---
updated-dependencies:
- dependency-name: redis
  dependency-version: 8.0.0
  dependency-type: direct:production
...

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

* Remove setex calls

* Update src/pretix/presale/views/user.py

Co-authored-by: luelista <weller@rami.io>

* Fix tests

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Raphael Michel <michel@pretix.eu>
Co-authored-by: Raphael Michel <michel@rami.io>
Co-authored-by: luelista <weller@rami.io>

src/tests/control/test_auth.py

@@ -523,7 +523,7 @@ class FakeRedis(object):
     def exists(self, rkey):
         return rkey in self.storage
 
-    def setex(self, rkey, value, expiration):
+    def set(self, rkey, value, **kwargs):
         self.storage[rkey] = value
 
     def execute(self):