Bump actions/cache from 4.0.2 to 4.2.0 #5790

Job	Run time
clang-format	18s
rstcheck	21s
cppcheck	6m 47s
black	31s
vale	30s
copyright_headers	17s
flake8	21s
forbidden_types	14s
isort	13s
lychee_IGNORED	27s
mypy	38s
pydocstyle	23s
pylint	37s
unused_names	18s
sphinx-rtd	3m 10s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	10m 42s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	14m 0s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	18m 56s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	19m 53s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	33m 4s
	1h 51m 40s

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