ci: Update connection string in integration test workflow

Author: exaby73

.github/workflows/integration-test-cluster-neo4j-4.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Populate .env
         run: |
           echo "PHP_VERSION=${{ matrix.php }}" > .env
-          echo "CONNECTION=neo4j://neo4j:testtest@core1" >> .env
+          echo "CONNECTION=neo4j://neo4j:testtest@neo4j" >> .env
       - uses: hoverkraft-tech/[email protected]
         name: Start services
         with: