Bump `conda-incubator/setup-miniconda` from 2.3.0 to 3.0.0 #4528

Job	Run time
black	25s
cppcheck	4m 10s
copyright_headers	17s
clang-format	20s
flake8	21s
forbidden_types	14s
isort	11s
lychee_IGNORED	31s
mypy	39s
pylint	36s
pydocstyle	17s
rstcheck	22s
unused_names	29s
vale	37s
sphinx-rtd	8m 33s
sphinx-conda	0s
build_linux (ubuntu-20.04, gcc, boost, optimize, warning)	12m 25s
build_linux (ubuntu-20.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	16m 39s
build_linux (ubuntu-20.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	17m 52s
build_linux (ubuntu-20.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	23m 21s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	23m 9s
	1h 51m 28s

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