Fix type annotation for connection pool

Co-Authored-By: Joe Moura <joao@crewai.com>

src/crewai/memory/storage/llm_response_cache_storage.py

@@ -23,7 +23,7 @@ class LLMResponseCacheStorage:
     ) -> None:
         self.db_path = db_path
         self._printer: Printer = Printer()
-        self._connection_pool = {}
+        self._connection_pool: Dict[int, sqlite3.Connection] = {}
         self._initialize_db()
 
     def _get_connection(self) -> sqlite3.Connection: