Pin duckdb at release hash 08e34c447b

Pin duckdb at release hash f31be57c18

DuckDB submodule pinned at v1.5.3

Bump duckdb submodule:
- Target branch: v1.5-variegata
- Date: 2026-05-19 21:55:33
- DuckDB SHA: 14eca11bd9d4a0de2ea0f078be588a9c1c5b279c
- Trigger:
https://github.com/duckdb/duckdb-python/actions/runs/26114996465

pin submodule at release hash

pin duckdb to 1.5.1

pin release

Prepare for v1.4.4 (duckdb#280)

Pin submodule commit

pin new duckdb core SHA

Submodule at 68d7555 for 1.4.2 release

DuckDB version 1.4.1