Drop extra blank line to satisfy newer black in Cloud Build

My local black was 24.10.0 (the pyproject floor) and was happy, but
Cloud Build's hatch env pulls the latest black which is stricter about
blank lines between imports and the next block.

Co-authored-by: kaggle-agent <kaggle-agent@users.noreply.github.com>

Author: paultimothymooney

src/kaggle/test/test_hackathons_cli.py

@@ -17,7 +17,6 @@
 from kaggle.api.kaggle_api_extended import KaggleApi
 from kaggle import cli as kaggle_cli
 
-
 # ---- Fixtures & helpers ----