build

Bump actions/setup-python from 5 to 6 #1578

Job	Run time
'py-mindeps' on py3.9	32s
'mypy' on py3.x	30s
ensure-catalog-matches-hook-config	23s
'twine-check' on py3.x	20s
Self-Check	17s
test-sdist	1m 47s
Test on ubuntu, py3.13	1m 59s
Test on ubuntu, py3.12	1m 52s
Test on windows, py3.11	2m 52s
Test on ubuntu, py3.10	2m 0s
Test on windows, py3.10	2m 58s
Test on windows, py3.9	2m 50s
Test on macos, py3.12	1m 47s
Test on windows, py3.13	3m 19s
Test on macos, py3.9	2m 27s
Test on macos, py3.10	2m 7s
Test on ubuntu, py3.11	1m 39s
Test on macos, py3.11	1m 45s
Test on windows, py3.12	3m 1s
Test on macos, py3.13	1m 54s
Test on ubuntu, py3.9	1m 57s
Collate results to check for skipped tests	9s
	38m 25s

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