remove unnecessary credentials passed to download-demo

Author: alistairewj

.github/workflows/mysql.yml

@@ -15,9 +15,6 @@ jobs:
 
       - name: Download demo data
         uses: ./.github/actions/download-demo
-        with:
-            gcp-project-id: ${{ secrets.GCP_PROJECT_ID }}
-            gcp-sa-key: ${{ secrets.GCP_SA_KEY }}
 
       - name: Extract demo data to local folder
         run: |