cmake

Bump actions/checkout from 5 to 6 #838

Job	Run time
macos-14 gnu_openmpi openmp=OFF Debug	3m 52s
macos-14 gnu_openmpi openmp=ON Debug	4m 26s
macos-14 gnu_openmpi openmp=OFF Release	11m 18s
macos-14 gnu_openmpi openmp=ON Release	10m 0s
windows mpiifort intelmpi openmp=ON Debug	3m 48s
windows mpiifx intelmpi openmp=ON Debug	3m 29s
windows mpiifx intelmpi openmp=OFF Debug	6m 9s
windows mpiifort intelmpi openmp=OFF Debug	3m 56s
windows mpiifort intelmpi openmp=ON Release	6m 8s
windows mpiifx intelmpi openmp=ON Release	6m 38s
windows mpiifort intelmpi openmp=OFF Release	6m 0s
${{ matrix.container }} ${{ matrix.compiler_mpi }} openmp=${{ matrix.openmp }} ${{ matrix.build_type }}	-1s
windows mpiifx intelmpi openmp=OFF Release	6m 56s
	1h 12m 39s

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