Run mypy also on the pytest tests. #649

Job	Run time
audit	30s
declare_variables	14s
mypy_pyright_ruff (3.13.1)	36s
mypy_pyright_ruff (3.12.8)	35s
nox (3.13.1, tests, ubuntu-24.04, virtualenv)	4m 10s
mypy_pyright_ruff (3.11.11)	40s
nox (3.13.1, tests, ubuntu-24.04, uv)	1m 3s
nox (3.13.1, tests, macos-15, virtualenv)	3m 2s
nox (3.13.1, tests, macos-15, uv)	49s
nox (3.13.1, examples, ubuntu-24.04, virtualenv)	2m 31s
nox (3.13.1, examples, ubuntu-24.04, uv)	38s
nox (3.13.1, examples, macos-15, virtualenv)	1m 43s
nox (3.13.1, examples, macos-15, uv)	35s
nox (3.12.8, tests, ubuntu-24.04, virtualenv)	1m 9s
nox (3.12.8, tests, ubuntu-24.04, uv)	59s
nox (3.12.8, tests, macos-15, virtualenv)	2m 50s
nox (3.12.8, tests, macos-15, uv)	51s
nox (3.12.8, examples, ubuntu-24.04, virtualenv)	41s
nox (3.12.8, examples, ubuntu-24.04, uv)	36s
nox (3.12.8, examples, macos-15, virtualenv)	1m 47s
nox (3.12.8, examples, macos-15, uv)	33s
nox (3.11.11, tests, ubuntu-24.04, virtualenv)	4m 35s
nox (3.11.11, tests, ubuntu-24.04, uv)	59s
nox (3.11.11, tests, macos-15, virtualenv)	3m 9s
nox (3.11.11, tests, macos-15, uv)	51s
nox (3.11.11, examples, ubuntu-24.04, virtualenv)	2m 50s
nox (3.11.11, examples, ubuntu-24.04, uv)	38s
nox (3.11.11, examples, macos-15, virtualenv)	2m 15s
nox (3.11.11, examples, macos-15, uv)	34s
	42m 23s

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