patch: fix duckdb `narwhals_to_native_dtype` for `Int32` and `UInt32`… #6038

Job	Run time
pytest-38 (3.8, windows-latest)	1m 13s
pytest-full-coverage (3.11, ubuntu-latest)	4m 44s
pytest-38 (3.8, ubuntu-latest)	48s
pytest-full-coverage (3.13, ubuntu-latest)	2m 52s
pytest-windows (3.10, windows-latest)	11m 8s
pytest-windows (3.12, windows-latest)	3m 51s
	24m 36s

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