coverity: Attempt at recursive git clone

Trying the YAML change before committing to master is too complicated.

Author: dridi

.github/workflows/coverity.yml

@@ -26,7 +26,9 @@ jobs:
             libunwind-dev \
             pkg-config \
             python3-sphinx
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
+        with:
+          submodules: true
       - run: ./autogen.sh
       - run: ./configure --with-persistent-storage
       - uses: vapier/[email protected]