Change token for PR preview deployment

Updated the token used for deploying previews from PAT_TOKEN to GITHUB_TOKEN.

Author: DecimalTurn

.github/workflows/preview.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           source-dir: ./
           preview-branch: main
-          token: ${{ secrets.PAT_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}