build: pin torch_2_11 group to torchao 0.18.0

Keep the highest-torch dependency group (torch==2.11.0, already the
project's torch ceiling) aligned with the newly-raised torchao ceiling.

Author: guru-desh

pyproject.toml

@@ -138,7 +138,7 @@ torch_2_10 = [
 ]
 torch_2_11 = [
     "torch==2.11.0",
-    "torchao==0.17.0",
+    "torchao==0.18.0",
     "torchvision==0.26.0",
 ]
 torch_2_8 = [