Update add-unanswered-to-project.yml to include github-token with necessary permissions (#14637)

Created a Fine-grained Personalized-Access Token (PAT), with the following permissions:
Read & write for Projects under Org permissions
Under repository permissions: Read access to Dependabot alerts, code, commit statuses, discussions, issues, merge queues, metadata, and pull requests
Read and Write access to actions and workflows
Saved it as a secret named ET_EXT_CONTRIB

Author: nil-is-all

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

@@ -12,6 +12,7 @@ jobs:
       - name: Add open issues and open, non-draft PRs to org project (excluding certain authors)
         uses: actions/github-script@v7
         with:
+          github-token: ${{ secrets.ET_EXT_CONTRIB }}
           script: |
             const projectId = "PVT_kwDOAUB9vs4A_PUL"; // PyTorch org project 136
             const owner = 'pytorch';