Update sponsors workflow to use SPONSORS_PAT secret

.github/workflows/sponsors.yml

@@ -26,7 +26,7 @@ jobs:
       - name: Generate Sponsors
         uses: JamesIves/github-sponsors-readme-action@v1
         with:
-          token: ${{ secrets.PAT }}
+          token: ${{ secrets.SPONSORS_PAT }}
           file: 'README.md'
           minimum: 1000
           template: '<a href="https://github.com/{{{ login }}}"><img src="{{{ avatarUrl }}}" width="80px" alt="User avatar: {{{ login }}}" /></a>&nbsp;&nbsp;'