ci: use ADD_TO_PROJECT_PAT for project board workflow

Author: yasithdev

.github/workflows/auto-add-to-project.yml

@@ -13,5 +13,5 @@ jobs:
       - uses: actions/add-to-project@v1.0.2
         with:
           project-url: https://github.com/orgs/cyber-shuttle/projects/2
-          github-token: ${{ secrets.PROJECT_TOKEN }}
+          github-token: ${{ secrets.ADD_TO_PROJECT_PAT }}