chore(datetime): use timezone-aware UTC timestamps (datetime.now(time… #11

Job	Run time
Lint and static analysis	23s
Code formatting	11s
Tests (3.10)	11s
Type checking	9s
Tests (3.11)	12s
Tests (3.12)	13s
Build and test (${{ matrix.os }}, py${{ matrix.python-version }})	0s
	1m 19s

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