build

Bump actions/download-artifact from 5 to 6 #1626

Job	Run time
'twine-check' on py3.x	26s
'mypy' on py3.x	30s
'py-mindeps' on py3.9	48s
test-sdist	1m 47s
ensure-catalog-matches-hook-config	20s
Self-Check	18s
Test on ubuntu, py3.9	1m 59s
Test on ubuntu, py3.11	1m 48s
Test on ubuntu, py3.12	1m 58s
Test on ubuntu, py3.10	2m 2s
Test on windows, py3.11	3m 34s
Test on windows, py3.9	4m 37s
Test on windows, py3.12	3m 41s
Test on ubuntu, py3.13	2m 1s
Test on windows, py3.10	3m 37s
Test on macos, py3.9	1m 37s
Test on windows, py3.13	3m 47s
Test on macos, py3.11	1m 15s
Test on macos, py3.10	2m 19s
Test on macos, py3.12	2m 21s
Test on macos, py3.13	1m 21s
Collate results to check for skipped tests	6s
	42m 12s

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