[generate_manifest] use GITHUB_TOKEN to create PR

Author: GabrielDrapor

.github/workflows/generate-manifest.yml

@@ -51,7 +51,7 @@ jobs:
       - name: Create Pull Request
         uses: peter-evans/create-pull-request@v5
         with:
-          token: ${{ secrets.MCPM_PERSONAL_ACCESS_TOKEN }}
+          token: ${{ secrets.GITHUB_TOKEN }}
           commit-message: |
             feat: add manifest for ${{ steps.repo-info.outputs.repo_name }}