Avoid mutating lockfile, format to pinned python version #668

Job	Run time
Set static values	3s
linters and formatters	13s
Run nox for tests and coverage (ubuntu-26.04, 3.15)	10s
Run nox for tests and coverage (ubuntu-26.04, 3.11)	10s
Run nox for tests and coverage (ubuntu-26.04, 3.12)	9s
Run nox for tests and coverage (ubuntu-26.04, 3.13)	9s
Run nox for tests and coverage (ubuntu-26.04, 3.14)	12s
coverage compile	13s
	1m 19s

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