ci: checkout submodules

Signed-off-by: Henry Gressmann <[email protected]>

Author: explodingcamera

.github/workflows/test.yaml

@@ -13,6 +13,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
+        with:
+          submodules: true
 
       - name: Install stable Rust toolchain
         run: |