theres no submodule v4

Author: smacke

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
     - uses: actions/checkout@v4
       with:
         fetch-depth: 1
-    - uses: smacke/submodule-checkout@v4
+    - uses: smacke/submodule-checkout@v3
       if: ${{ matrix.os == 'ubuntu-latest' && matrix.python-version != '3.10'}}
       with:
         ssh-key: '${{ secrets.TEST_DATA_SECRET }}'