fix git checkout

Author: djankows

.github/workflows/maven-pr-3.0.yml

@@ -18,9 +18,7 @@ jobs:
       MAVEN_PASSWORD: ${{ secrets.MAVEN_CENTRAL_PASSWORD }}
     steps:
       - uses: actions/checkout@v4
-        name: git checkout 3.0.0
-        with:
-          ref: 3.0.0
+        name: git checkout
       - name: Set up Java
         uses: actions/setup-java@v4
         with: