duckdb: disable non-deterministic test_connection_interrupt

pkgs/development/python-modules/duckdb/default.nix

···
   disabledTests = [
     # tries to make http request
     "test_install_non_existent_extension"
+    # test is racy and interrupt can be delivered before or after target point
+    "test_connection_interrupt"
   ];
 
   preCheck = ''