Constrain pybind11 to be <2.12.0

As a workaround fro conda-forge/pybind11-feedstock#94 (comment) .

Author: traversaro

recipe/meta.yaml

@@ -112,7 +112,8 @@ outputs:
         - {{ pin_subpackage(namecxx, exact=True) }}
         - python
         - pip
-        - pybind11
+        # Workaround for https://github.com/conda-forge/pybind11-feedstock/pull/94#issuecomment-2033804227
+        - pybind11 <2.12.0
         - pybind11-abi
         - liblie-group-controllers
         - libyarp