ci: move TELEGRAM_CHAT_ID to secrets

Author: Sehat1137

.github/workflows/new-event-notify.yml

@@ -20,5 +20,5 @@ jobs:
         uses: sehat1137/telegram-notifier@5d130037eb80a33251f3afe8bc56447236acab77 # v 1.3.0
         with:
           tg-bot-token: ${{ secrets.TELEGRAM_BOT_TOKEN }}
-          tg-chat-id: ${{ vars.TELEGRAM_CHAT_ID }}
+          tg-chat-id: ${{ secrets.TELEGRAM_CHAT_ID }}
           github-token: ${{ secrets.GITHUB_TOKEN }}