👷 👷 update maven-publish.yml

Author: gangb-tech

.github/workflows/maven-publish.yml

@@ -9,6 +9,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
+      with:
+        submodules: 'recursive'
       - name: Set up Maven Central Repository
         uses: actions/setup-java@v2
         with: