ci: skip tinygrad bump in repo-maintenance (#1173)

.github/workflows/repo-maintenance.yaml

@@ -50,6 +50,7 @@ jobs:
     - name: bump submodules
       run: |
         git config --global --add safe.directory '*'
+        git config submodule.tinygrad.update none
         git submodule update --remote
         git add .
     - name: update car docs