Loosen pylint threshold #5735

Job	Run time
clang-format	18s
copyright_headers	18s
cppcheck	6m 57s
forbidden_types	15s
lychee_IGNORED	25s
mypy	38s
pydocstyle	20s
rstcheck	26s
unused_names	18s
vale	30s
black	37s
flake8	20s
isort	11s
pylint	40s
sphinx-rtd	3m 0s
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)	14m 34s
build_linux (ubuntu-22.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	19m 31s
build_linux (ubuntu-22.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	19m 59s
build_linux (ubuntu-22.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	32m 27s
	1h 53m 9s

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