fix: shutdown hangs

webhooks/webhook_batcher.py

@@ -196,7 +196,12 @@ class WebhookBatcher:
         
         # Shutdown the thread pool executor
         try:
-            self.executor.shutdown(wait=True, timeout=10)  # Wait up to 10 seconds
+            # Use timeout parameter only if supported (Python 3.9+)
+            import sys
+            if sys.version_info >= (3, 9):
+                self.executor.shutdown(wait=True, timeout=10)  # Wait up to 10 seconds
+            else:
+                self.executor.shutdown(wait=True)  # No timeout for older Python versions
             _log("INFO", "Thread pool executor shut down successfully")
         except Exception as e:
             _log("WARNING", f"Error shutting down thread pool: {e}")