Update docgen.yml

Author: narendasan

.github/workflows/docgen.yml

@@ -12,7 +12,7 @@ jobs:
   build-docs:
     runs-on: ubuntu-20.04
     container:
-      image: nvidia/cuda:11.3.1-devel-ubuntu20.04
+      image: ghcr.io/pytorch/tensorrt/docgen:latest
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
@@ -88,4 +88,4 @@ jobs:
           file_pattern: docs/
           commit_user_name: Torch-TensorRT Github Bot
           commit_user_email: [email protected]
-          commit_author: Torch-TensorRT Github Bot <[email protected]>
+          commit_author: Torch-TensorRT Github Bot <[email protected]>