Stop nox clean session from breaking venvs #408

Job	Run time
mypy strict enforcement	21s
Run nox for tests and coverage (macos-latest, 3.8)	28s
Run nox for tests and coverage (macos-latest, 3.9)	1m 30s
Run nox for tests and coverage (macos-latest, 3.10)	21s
Run nox for tests and coverage (macos-latest, 3.11)	23s
Run nox for tests and coverage (macos-latest, 3.12)	52s
Run nox for tests and coverage (windows-latest, 3.8)	1m 29s
Run nox for tests and coverage (windows-latest, 3.9)	1m 4s
Run nox for tests and coverage (windows-latest, 3.10)	36s
Run nox for tests and coverage (windows-latest, 3.11)	37s
Run nox for tests and coverage (windows-latest, 3.12)	1m 9s
Run nox for tests and coverage (ubuntu-latest, 3.8)	18s
Run nox for tests and coverage (ubuntu-latest, 3.9)	15s
Run nox for tests and coverage (ubuntu-latest, 3.10)	16s
Run nox for tests and coverage (ubuntu-latest, 3.11)	20s
Run nox for tests and coverage (ubuntu-latest, 3.12)	19s
coverage compile	20s
CI steps all completed successfully	1s
	10m 39s

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