Fixed typo in the RC deployment workflow.

Author: Ardiea

.github/workflows/rc-deploy.yml

@@ -45,8 +45,8 @@ jobs:
       - name: Purge Fastly cache
         uses: jcoene/fastly-purge-action@master
         with:
-          api_key: "${{ secrets.FASTLY_API_KEY_QA }}"
-          service_id: "${{ secrets.FASTLY_SERVICE_ID_QA }}"
+          api_key: "${{ secrets.FASTLY_API_KEY_RC }}"
+          service_id: "${{ secrets.FASTLY_SERVICE_ID_RC }}"
   on_failure:
     runs-on: ubuntu-latest
     if: >