Bump conda-incubator/setup-miniconda from 2.3.0 to 3.0.0 #4527

Job	Run time
black	24s
clang-format	26s
copyright_headers	18s
cppcheck	3m 53s
flake8	29s
forbidden_types	18s
isort	16s
lychee_IGNORED	21s
mypy	35s
pydocstyle	28s
pylint	32s
rstcheck	29s
unused_names	13s
vale	37s
build_macos (macos-latest, clang, openmp, mpi, python, gsl, ltdl, boost, hdf5, optimize, warning)	28m 24s
build_linux (ubuntu-20.04, gcc, boost, optimize, warning)	12m 12s
build_linux (ubuntu-20.04, gcc, openmp, python, gsl, ltdl, boost, optimize, warning)	17m 33s
build_linux (ubuntu-20.04, gcc, mpi, python, gsl, ltdl, boost, optimize, warning)	18m 38s
build_linux (ubuntu-20.04, gcc, openmp, mpi, python, gsl, ltdl, boost, hdf5, sionlib, libneurosim...	24m 14s
sphinx-rtd	9m 28s
sphinx-conda	0s
	1h 59m 48s

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