fix: pull submodules on checkout in all CI workflows (#124)

Author: khvn26

.github/workflows/code-coverage.yml

@@ -14,6 +14,8 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
+        with:
+          submodules: recursive
 
       - name: Set up JDK (${{ env.java }} ${{ env.distribution }})
         uses: actions/setup-java@v2

.github/workflows/codeql.yml

@@ -39,6 +39,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v2
+        with:
+          submodules: recursive
 
       - name: Set up JDK (${{ matrix.java }} ${{ matrix.distribution }})
         uses: actions/setup-java@v2