adjust hardcoded py3.10 nox actions

Author: abbrowne126

.librarian/generator-input/noxfile.py

@@ -357,8 +357,7 @@ def cover(session):
     session.run("coverage", "erase")
 
 
-# py > 3.10 not supported yet
-@nox.session(python="3.10")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def docs(session):
     """Build the docs for this library."""
 
@@ -393,8 +392,7 @@ def docs(session):
     )
 
 
-# py > 3.10 not supported yet
-@nox.session(python="3.10")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def docfx(session):
     """Build the docfx yaml files for this library."""