Try to do fetching as part of checkout action

.github/workflows/submodule-pin-check.sh

@@ -10,7 +10,7 @@ for mod in `git submodule --quiet foreach 'echo $name'`; do
 	branch=origin/HEAD
 	if [[ -v exceptions[$mod] ]]; then
 		branch=${exceptions[$mod]}
-		git -C $mod fetch `echo $branch | tr "/" " "`
+		#git -C $mod fetch `echo $branch | tr "/" " "`
 	fi
 
 	if ! git -C $mod merge-base --is-ancestor HEAD $branch; then

.github/workflows/submodule-pin-check.yml

@@ -13,6 +13,7 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
         with:
+          fetch-depth: 0
           submodules: recursive
 
       - name: Check all submodules are ancestors of origin/HEAD or configured branch