fixup: changing assertion

Signed-off-by: Simon Schrottner <[email protected]>

Author: aepfli

providers/openfeature-provider-flagd/tests/test_grpc_watcher.py

@@ -147,7 +147,7 @@ def test_selector_passed_via_both_metadata_and_body(self):
         self.run_listen_and_shutdown_after()
 
         # Verify SyncFlags was called
-        self.mock_stub.SyncFlags.assert_called_once()
+        self.mock_stub.SyncFlags.assert_called()
 
         # Get the call arguments
         call_args = self.mock_stub.SyncFlags.call_args