build

Use calendar.timegm instead of time.mktime for UTC timestamps #1507

Job	Run time
Self-Check	12s
test-sdist	1m 43s
ensure-catalog-matches-hook-config	17s
'twine-check' on py3.x	24s
'mypy' on py3.x	23s
'py-mindeps' on py3.9	29s
Test on ubuntu, py3.9	1m 12s
Test on windows, py3.9	1m 5s
Test on ubuntu, py3.10	1m 9s
Test on windows, py3.10	1m 3s
Test on ubuntu, py3.12	1m 9s
Test on windows, py3.12	1m 3s
Test on ubuntu, py3.11	59s
Test on windows, py3.11	1m 5s
Test on macos, py3.11	1m 0s
Test on macos, py3.9	1m 14s
Test on windows, py3.13	1m 5s
Test on macos, py3.13	1m 10s
Test on macos, py3.10	1m 1s
Test on macos, py3.12	50s
Test on ubuntu, py3.13	1m 13s
Collate results to check for skipped tests	-1s
	19m 45s

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