Update checkout action to 4.0.0 #75

Job	Run time
build (-Dwith_openmp=false, -Dwith_atlas=false, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_f...	34s
build (-Dwith_openmp=false, -Dwith_atlas=false, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_f...	57s
build (-Dwith_openmp=false, -Dwith_atlas=true, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_ff...	34s
build (-Dwith_openmp=false, -Dwith_atlas=true, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_ff...	45s
build (-Dwith_openmp=true, -Dwith_atlas=false, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_ff...	41s
build (-Dwith_openmp=true, -Dwith_atlas=false, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_ff...	39s
build (-Dwith_openmp=true, -Dwith_atlas=true, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_fft...	39s
build (-Dwith_openmp=true, -Dwith_atlas=true, -Dwith_superlu=true -Dwith_umfpack=true, -Dwith_fft...	51s
	5m 40s

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