Cache_redis missing check on clean method

[DONEILL-emp]

Description of the problem
Calling ee()->cache->clean(); when connected to the Redis driver causing a deprecated error.
Need to check for the del method as you do in the delete method
if (method_exists($this->_redis, 'del')) { // $this->_redis->del } else ...

How To Reproduce

1. Set the 'cache_driver' to redis
2. Call ee()->cache->clean();

Error Messages
The delete function is deprecated: system/ee/legacy/libraries/Cache/drivers/Cache_redis.php:100

Environment Details:

• Version: 7.4.11
• PHP Version 8.1
• MySQL Version 8.0
• OS: Linux
• Web Server: nginx

Possible Solution
Use the same if check as other methods such as delete to ensure calling the del method and not the delete method