build

Remove support for Python 3.9 #1721

Job	Run time
'twine-check' on py3.x	29s
'mypy' on py3.x	27s
ensure-catalog-matches-hook-config	22s
Self-Check	11s
Test on ubuntu, py3.10	2m 51s
Test on ubuntu, py3.13	3m 1s
Test on ubuntu, py3.11	2m 46s
Test on ubuntu, py3.14	1m 50s
'py-mindeps' on py3.10	48s
test-sdist	1m 45s
Test on ubuntu, py3.12	2m 44s
Test on windows, py3.14	3m 7s
Test on windows, py3.12	4m 26s
Test on windows, py3.10	4m 58s
Test on macos, py3.12	1m 40s
Test on windows, py3.13	4m 15s
Test on macos, py3.13	2m 27s
Test on macos, py3.14	1m 51s
Test on windows, py3.11	4m 43s
Test on macos, py3.11	3m 8s
Test on macos, py3.10	2m 20s
Collate results to check for skipped tests	5s
	50m 14s

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