Use the same `now` for all in merge check #254

Job	Run time
Build distribution packages	20s
Test with nox (amd64, ubuntu-24.04, 3.12, pytest_min)	1m 6s
Test with nox (amd64, ubuntu-24.04, 3.12, ci_checks_max)	1m 38s
Test with nox (arm, ubuntu-24.04, 3.12, pytest_min)	1m 32s
Test with nox (arm, ubuntu-24.04, 3.11, ci_checks_max)	1m 55s
Test with nox (arm, ubuntu-24.04, 3.11, pytest_min)	1m 32s
Test with nox (amd64, ubuntu-24.04, 3.11, pytest_min)	1m 5s
Test with nox (amd64, ubuntu-24.04, 3.11, ci_checks_max)	1m 39s
Test documentation website generation	0s
Test with nox (arm, ubuntu-24.04, 3.12, ci_checks_max)	2m 2s
Test package installation (arm, ubuntu-24.04, 3.11)	44s
Test package installation (amd64, ubuntu-24.04, 3.12)	18s
Test package installation (amd64, ubuntu-24.04, 3.11)	16s
Test package installation (arm, ubuntu-24.04, 3.12)	44s
Test package installation	3s
Test with nox	2s
Publish documentation website to GitHub pages	32s
Create GitHub release	0s
Publish packages to PyPI	-1s
	15m 27s

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