Revert "Upgrade DuckDB to 1.5.5" — MotherDuck only supports 1.5.4

[nishantmonu51]

• Reverts Upgrade DuckDB to 1.5.5 #9751, pinning github.com/duckdb/duckdb-go/v2 back to v2.10504.0 (DuckDB 1.5.4)
• MotherDuck does not yet support DuckDB 1.5.5, so the upgrade breaks MotherDuck connectivity

Checklist:

• Covered by tests
• Ran it and it works as intended
• Reviewed the diff before requesting a review
• Checked for unhandled edge cases
• Linked the issues it closes
• Checked if the docs need to be updated. If so, create a separate Linear DOCS issue
• Intend to cherry-pick into the release branch
• I'm proud of this work!