tests

Remove utcnow() deprecation warning. #927

Job	Run time
Check for spelling errors	7s
lint	19s
docs	17s
package-source	11s
package-wheel (macos-latest, arm64)	3m 6s
test (ubuntu-latest, 3.12)	1m 6s
package-wheel (macos-latest, x86_64)	7m 23s
test (ubuntu-latest, 3.11)	1m 7s
package-wheel (ubuntu-latest, aarch64)	25m 45s
test (ubuntu-latest, 3.10)	59s
package-wheel (ubuntu-latest, i686)	1m 27s
test (ubuntu-latest, 3.9)	1m 7s
package-wheel (ubuntu-latest, x86_64)	5m 3s
test (ubuntu-latest, 3.8)	1m 6s
package-wheel (windows-latest, AMD64)	10m 42s
test (macos-latest, 3.12)	2m 8s
package-wheel (windows-latest, x86)	3m 29s
test (macos-latest, 3.11)	1m 13s
test (macos-latest, 3.10)	1m 9s
test (macos-latest, 3.9)	1m 16s
test (macos-latest, 3.8)	1m 8s
test (windows-latest, 3.12)	3m 49s
test (windows-latest, 3.11)	3m 55s
test (windows-latest, 3.10)	3m 50s
test (windows-latest, 3.9)	2m 41s
test (windows-latest, 3.8)	3m 46s
publish	17s
	1h 28m 26s

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