Fix schedule and cron (#2180)

Author: sheneska

.github/workflows/acceptance_tests_kind.yaml

@@ -13,7 +13,7 @@ on:
         description: Terraform version
         default: 1.4.0
   schedule:
-    cron: '0 21 * * *'
+    - cron: '0 21 * * *'
 
 env:
   KUBECONFIG: ${{ github.workspace }}/.kube/config