Optimize computation in iaf_psc_alpha_ps model #5677

Job	Run time
black	32s
clang-format	21s
copyright_headers	20s
cppcheck	6m 59s
flake8	25s
forbidden_types	15s
isort	12s
lychee_IGNORED	28s
mypy	37s
pydocstyle	23s
rstcheck	25s
pylint	42s
unused_names	19s
vale	39s
sphinx-rtd	3m 6s
sphinx-conda	0s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	11m 58s
build_linux (ubuntu-22.04, gcc, boost, optimize, warning)	12m 51s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	18m 46s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	20m 31s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	33m 16s
	1h 53m 5s

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