Interpret naive datetimes as UTC #1692

Job	Run time
docs	1m 47s
min-versions	13s
dev and docs requirements check	21s
build (3.9, ubuntu-latest)	1m 10s
pre-release	35s
upstream	0s
build (3.9, windows-latest)	3m 12s
build (3.10, ubuntu-latest)	1m 12s
build (3.10, windows-latest)	2m 25s
build (3.10, macos-latest)	1m 14s
build (3.11, ubuntu-latest)	55s
build (3.11, windows-latest)	3m 20s
build (3.11, macos-latest)	57s
build (3.12, ubuntu-latest)	1m 6s
build (3.12, windows-latest)	2m 48s
build (3.12, macos-latest)	55s
	22m 10s

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