test(test_caching_handler.py): move to in-memory cache - prevent redis flakiness from impacting ci/cd

tests/local_testing/test_caching_handler.py

@@ -40,12 +40,7 @@ import logging
 
 def setup_cache():
     # Set up the cache
-    cache = Cache(
-        type=LiteLLMCacheType.REDIS,
-        host=os.environ["REDIS_HOST"],
-        port=os.environ["REDIS_PORT"],
-        password=os.environ["REDIS_PASSWORD"],
-    )
+    cache = Cache(type=LiteLLMCacheType.LOCAL)
     litellm.cache = cache
     return cache