- use submodules: recursive in checkout so libczirw-sys's nested libczi submodule (CMake source tree) is actually fetched in CI

.github/workflows/publish_pypi.yml

@@ -16,7 +16,7 @@ jobs:
     steps:
       - uses: actions/checkout@v6
         with:
-          submodules: true
+          submodules: recursive
       - uses: actions/setup-python@v5
         with:
           python-version: 3.x