fix: pin pybind11 < 2.10 for now (#43)

* chore: try pinning pybind11

* Update pyproject.toml

* revert: pin again

pyproject.toml

 [build-system]
 requires = [
     "setuptools>=42",
-    "pybind11>=2.9.2",
+    "pybind11~=2.9.2",
     "cmake>=3.22",
-    "scikit-build>=0.14.1",
+    "scikit-build>=0.15.0",
 ]
 
 build-backend = "setuptools.build_meta"