Remove `.python-version` #46

Job	Run time
pre-commit	52s
pytest (ubuntu-latest, 3.14, highest)	11s
pytest (ubuntu-latest, 3.14, lowest-direct)	11s
pytest (macos-latest, 3.14, highest)	20s
pyright	10s
pytest (macos-latest, 3.14, lowest-direct)	20s
ruff	6s
	2m 10s

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