gh(deps): bump actions/setup-python from 6 to 7 #775

Job	Run time
pytest-mpi (3.11)	43m 3s
pytest-mpi (pytest-mpi-docker-gcc-arm)	19m 24s
pytest-mpi (3.10)	46m 1s
pytest-mpi (pytest-mpi-docker-gcc)	29m 17s
pytest-mpi (pytest-mpi-docker-icx)	33m 50s
	2h 51m 35s

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