Try to get sha right

Author: nateinaction

.github/workflows/ci.yaml

@@ -43,7 +43,10 @@ jobs:
 
     - name: Submodule Cache Key
       run: |
-        echo "submodule_cache_key=$(git submodule | sha256)" >> $GITHUB_OUTPUT
+        git submodule
+        git submodule | sha256sum
+        echo "submodule_cache_key=$(git submodule | sha256sum)"
+        echo "submodule_cache_key=$(git submodule | sha256sum)" >> $GITHUB_OUTPUT
       shell: bash
 
     - name: Cache submodules