tests

Bump actions/cache from 2 to 4 #2381

Job	Run time
test_indentation	30s
coverage	3m 29s
test_windows (windows-2022, Release, Visual Studio 17 2022)	2m 41s
test_linux_and_macos_mpi (ubuntu-24.04, Release)	2m 24s
test_linux_non_unity_no_optional_dependencies (ubuntu-24.04, Debug)	2m 59s
test_windows (windows-2022, Debug, Visual Studio 17 2022)	9m 48s
test_linux_and_macos_mpi (macos-13, Release)	2m 55s
test_linux_and_macos (ubuntu-22.04, Release)	1m 55s
test_linux_and_macos (ubuntu-22.04, Debug)	1m 57s
linux-clang_flang_mpi (ubuntu-24.04, Debug)	2m 12s
test_linux_and_macos (ubuntu-24.04, Release)	1m 48s
linux-gdb-valgrind (ubuntu-22.04, Debug)	16m 22s
test_linux_and_macos (ubuntu-24.04, Debug)	1m 41s
test_linux_and_macos (macos-13, Release)	2m 54s
test_linux_and_macos (macos-13, Debug)	3m 9s
linux-cmake_mpi (ubuntu-24.04, 2.8.12, TRUE, Release)	3m 9s
linux-cmake_mpi (ubuntu-24.04, 2.8.12, FALSE, Release)	3m 5s
linux-gcc_mpi (ubuntu-20.04, Debug)	2m 5s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, TRUE, Release)	3m 38s
linux-clang_gfortran_mpi (ubuntu-24.04, Debug)	2m 5s
linux-gcc_no_apps (ubuntu-20.04, Debug)	58s
linux-cmake_mpi (ubuntu-24.04, 3.16.x, FALSE, Release)	2m 7s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, TRUE, Release)	2m 37s
linux-cmake_mpi (ubuntu-24.04, 3.20.x, FALSE, Release)	2m 10s
	1h 18m 38s

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