changed type of _clients in TelemetryClientFactory

Signed-off-by: Sai Shree Pradhan <saishree.pradhan@databricks.com>

Author: saishreeeee

src/databricks/sql/telemetry/telemetry_client.py

@@ -269,8 +269,8 @@ class TelemetryClientFactory:
     """
 
     _clients: Dict[
-        str, TelemetryClient
-    ] = {}  # Map of connection_uuid -> TelemetryClient
+        str, BaseTelemetryClient
+    ] = {}  # Map of connection_uuid -> BaseTelemetryClient
     _executor: Optional[ThreadPoolExecutor] = None
     _initialized: bool = False
     _lock = threading.Lock()  # Thread safety for factory operations