Update pr-auto-update.yml

Signed-off-by: Matty Widdop <18513864+MattyTheHacker@users.noreply.github.com>

Author: MattyTheHacker

.github/workflows/pr-auto-update.yml

@@ -14,7 +14,7 @@ jobs:
         uses: actions/create-github-app-token@v2
         id: generate-token
         with:
-          app-id: 1363586
+          app-id: ${{ secrets.PR_AUTO_UPDATE_CLIENT_ID }}
           private-key: ${{ secrets.PR_AUTO_UPDATE_PRIVATE_KEY }}
 
       - uses: CSSUoB/pr-auto-updater@v2.1.2