Install libtpu directly instead of torch_xla[tpu] (#9423)

Author: bhavya01

infra/ansible/config/pip.yaml

@@ -44,7 +44,7 @@ pip:
       - mkl-include
 
     release_tpu:
-      - torch_xla[tpu]
+      - libtpu
 
   # Packages that will be installed with the `--nodeps` flag.
   pkgs_nodeps: