build: Add pybind11[global] to buildbase (#8703)

This change adds pybind11[global] to the pip install command to facilitate re/building of the PyTorch backend with Meta OpTree support.

CI Pipeline ID: 46269936

Author: whoisj

build.py

@@ -1116,7 +1116,8 @@ def create_dockerfile_buildbase(ddir, dockerfile_name, argmap):
           docker \\
           virtualenv \\
           patchelf==0.17.2 \\
-          cmake==4.0.3
+          cmake==4.0.3 \\
+          pybind11[global]
 """
 
         df += f"""