Optimize computation in iaf_psc_alpha_ps model #5681

Job	Run time
black	33s
clang-format	20s
copyright_headers	16s
cppcheck	7m 15s
flake8	21s
forbidden_types	15s
isort	14s
lychee_IGNORED	24s
mypy	38s
pydocstyle	20s
pylint	36s
rstcheck	25s
unused_names	17s
vale	37s
sphinx-rtd	3m 9s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	11m 55s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	14m 41s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	18m 54s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	21m 1s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	33m 48s
	1h 55m 59s

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