Disable some Python bindings in {hxtorch,pynn-brainscales}

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!195

This is a workaround for pysctrltp not detecting newer versions
of pybind11 correctly, and for `pyhxcomm` building a test binary linking
against stuff which requires linkage against libpython.
The real fix requires CR within the software stack and will only be
available later.

Bugfix for NEST installation with Python other than 3.8

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!192

This reverts merge request !189

This reverts commit 567e3819

Add Arbor v0.8

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!189

Add recent versions of fmt, py-pybind11 needed for arbor@0.8 from spack v0.19.0 upstream

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!191

Update packages/py-pybind11/package.py, packages/fmt/fmt-attributes-cpp11_4.1.0.patch, packages/fmt/fmt-no-export-cpp11flag_3.0.0.patch, packages/fmt/fmt-use-cmake-cxx-standard_3.0.0.patch, packages/fmt/package.py

Update packages/py-snudda/package.py to version 1.3.2

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!187

Add py-deap (DEAP) as dep to pynn-brainscales

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!184

Add py-deap (DEAP) as dep to pynn-brainscales

See merge request rstock/ebrains-spack-builds!1

Needed for an upcoming complex neuron demo on BSS-2.

Update BrainScaleS software to 4.0-a1

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!180

Updated to Snudda to version 1.3.0

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!179

Add and update Snudda

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!181

Update py-elephant to 0.11.2

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!178

Add `install_test` for `nest` package

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!177

Replace [hxtorch|pynn-brainscales] pkg-config by virtual package

See merge request technical-coordination/project-internal/devops/platform/ebrains-spack-builds!175

Suggested by CINECA.