doc: use autoapi from theme

Author: jorgepiloto

pyproject.toml

@@ -65,7 +65,6 @@ doc = [
   "ansys-sphinx-theme[autoapi]==1.6.3",
   "grpcio==1.71.2",
   "grpcio-health-checking==1.71.2",
-  "sphinx-autoapi==3.6",
   "sphinx-click==4.4",
   "sphinx-copybutton==0.5.2",
   "sphinx-design==0.6.1",