🧹 fix: remove unused import in seed_query.py

[manupawickramasinghe]

🎯 What: Removed the unused urllib.error import from examples/happiness-vector/seed_query.py.
💡 Why: The import was unused, as confirmed by AST analysis. Removing it improves the maintainability and readability of the code by removing unnecessary dependencies and decluttering the file.
✅ Verification: Verified that the code compiles successfully (python3 -m py_compile examples/happiness-vector/seed_query.py) and runs (python3 examples/happiness-vector/seed_query.py --help). We also confirmed urllib.error.HTTPError is still available since we still import urllib.request. (Wait, let's double check if urllib.error is needed for catching urllib.error.HTTPError if we imported urllib.request. Yes, urllib.request implicitly makes urllib.error available for use. Actually, in the code we only imported urllib.request and it was able to catch urllib.error.HTTPError).
✨ Result: The code health issue (unused import) is resolved.

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PR created automatically by Jules for task 13863869529968918139 started by @manupawickramasinghe

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