Bump step-security/harden-runner from 2.8.1 to 2.9.0 #5516

Job	Run time
clang-format	20s
black	32s
copyright_headers	20s
cppcheck	7m 7s
forbidden_types	26s
isort	12s
lychee_IGNORED	25s
mypy	36s
pydocstyle	22s
pylint	35s
rstcheck	23s
unused_names	18s
vale	31s
flake8	23s
sphinx-rtd	3m 17s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	11m 25s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	12m 9s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	17m 53s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	18m 43s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	33m 5s
	1h 49m 2s

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