Update healthcheck-app-existingVnet-Lin-Thurs.yml

change scheduled time

Author: hgullapa

.github/workflows/healthcheck-app-existingVnet-Lin-Thurs.yml

@@ -8,7 +8,7 @@ name: MATLAB Web App Server Ref Arch Azure Existing Virtual Network Health Check
 on:
  workflow_dispatch:
  schedule:
-    - cron: '0 16 * * 4'
+    - cron: '0 12 * * 4'
 jobs:
   build:
     runs-on: ubuntu-latest