Update on "pin bump with better architecture"

This diff bump torch pin to 1008.

also expose cuda version into torch_pin.py for better update if needed;

Differential Revision: [D84280496](https://our.internmc.facebook.com/intern/diff/D84280496/)

[ghstack-poisoned]

Author: Gasoonjia

docs/source/conf.py

@@ -24,7 +24,7 @@
 import sys
 from typing import Any
 
-import pytorch_sphinx_theme2  # type: ignore[import-untyped]
+import pytorch_sphinx_theme2  # type: ignore[import-not-found]
 
 # To let us import ./custom_directives.py
 sys.path.insert(0, os.path.abspath("."))