Add missing numpy host dependency and constrain pybind11 < 2.12.0 for ABI Windows problem

[traversaro]

Something that I overlooked when packaging Python bindings to C++ libraries that wrap eigen vector or matrices via the pybind/eigen.h header is that those bindings depends on numpy ABI (via the include sequence pybind/eigen.h --> pybind/eigen/matrix.h --> pybind/numpy.h).

We never noticed this as for a long time numpy 1 was just ABI stable, but now that numpy 2 came out, we are seeing problems (see segfaults in conda-forge/bipedal-locomotion-framework-feedstock#69 and conda-forge/bipedal-locomotion-framework-feedstock#72).

For manifpy and bipedal-locomotion-framework python users: in a nutshell if we see something strange (i.e. segfaults) in conda environments with old versions of manifpy and bipedal-locomotion-framework, a easy workaround is just to pin numpy<2. A cleaner solution would be to prepare a repodata patch (see https://github.com/conda-forge/conda-forge-repodata-patches-feedstock), but as that takes time to do it properly I would prefer to avoid it unless we actually see the need to do it.

The pybind11 constrain is instead necessary for conda-forge/pybind11-feedstock#94 (comment) .

Checklist

• Used a personal fork of the feedstock to propose changes
• Bumped the build number (if the version is unchanged)
• Reset the build number to 0 (if the version changed)
• Re-rendered with the latest conda-smithy (Use the phrase @conda-forge-admin, please rerender in a comment in this PR for automated rerendering)
• Ensured the license file is being packaged.

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

I do have some suggestions for making it better though...

For recipe:

• This recipe is using a compiler, which now requires adding a build dependence on {{ stdlib("c") }} as well. Note that this rule applies to each output of the recipe using a compiler. For further details, please see META: {{ stdlib("c") }} migration conda-forge.github.io#2102.

[traversaro]

@conda-forge-admin, please rerender

[conda-forge-webservices]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[traversaro]

@conda-forge-admin, please rerender

[github-actions]

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