chore: update dep upstream beforehand

Author: diegomarquezp

hermetic_build/library_generation/owlbot/templates/java_library/.github/workflows/update_generation_config.yaml

@@ -32,7 +32,7 @@ jobs:
         token: ${{ secrets.CLOUD_JAVA_BOT_TOKEN }}
     - name: Install Dependencies
       shell: bash
-      run: sudo apt install -y libxml2-utils
+      run: sudo apt-get update && sudo apt-get install -y libxml2-utils
     - name: Update params in generation config to latest
       shell: bash
       run: |