Properly clean up timer in `stop()` (#165) #535

Job	Run time
Build distribution packages	35s
Test with nox (amd64, ubuntu-24.04, 3.11, ci_checks_max)	1m 46s
Test with nox (amd64, ubuntu-24.04, 3.12, ci_checks_max)	1m 49s
Test with nox (amd64, ubuntu-24.04, 3.12, pytest_min)	1m 25s
Test with nox (arm, ubuntu-24.04, 3.12, ci_checks_max)	2m 15s
Test with nox (arm, ubuntu-24.04, 3.11, ci_checks_max)	2m 12s
Test with nox (arm, ubuntu-24.04, 3.12, pytest_min)	1m 53s
Test with nox (amd64, ubuntu-24.04, 3.11, pytest_min)	1m 19s
Test with nox (arm, ubuntu-24.04, 3.11, pytest_min)	1m 46s
Test documentation website generation	-1s
Test package installation (amd64, ubuntu-24.04, 3.11)	38s
Test package installation (arm, ubuntu-24.04, 3.12)	1m 24s
Test package installation (amd64, ubuntu-24.04, 3.12)	37s
Test package installation (arm, ubuntu-24.04, 3.11)	1m 19s
Test package installation	2s
Test with nox	2s
Publish documentation website to GitHub pages	54s
Create GitHub release	0s
Publish packages to PyPI	0s
	19m 55s

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