Fix update-package-manifests workflow PR creation permission error

[Copilot]

The update-package-manifests workflow failed to create PRs after releases with error: "GitHub Actions is not permitted to create or approve pull requests." This occurs because the default GITHUB_TOKEN lacks permission to create PRs.

Changes

• Added token: ${{ secrets.RELEASE_TOKEN }} to the peter-evans/create-pull-request action in .github/workflows/update-package-manifests.yml
• Aligns with existing pattern used in prepare-release.yml and release.yml workflows

- name: Create Pull Request
  uses: peter-evans/create-pull-request@271a8d0340265f705b14b6d32b9829c1cb33d45e
  with:
    token: ${{ secrets.RELEASE_TOKEN }}  # Added
    commit-message: "chore: update winget and homebrew for v${{ steps.version.outputs.version }}"
    # ...

This enables the workflow to successfully create PRs updating Homebrew and WinGet manifests after each release.

Original prompt

fix the upate homebrew and winget manifest pipeline for the following error message:

  /usr/bin/git push --force-with-lease origin release/v0.3.4-post:refs/heads/release/v0.3.4-post

  remote: 

  remote: Create a pull request for 'release/v0.3.4-post' on GitHub by visiting:        

  remote:      https://github.com/microsoft/wassette/pull/new/release/v0.3.4-post        

  remote: 

  To https://github.com/microsoft/wassette

   * [new branch]      release/v0.3.4-post -> release/v0.3.4-post

Create or update the pull request

  Attempting creation of pull request

  Error: GitHub Actions is not permitted to create or approve pull requests. - https://docs.github.com/rest/pulls/pulls#create-a-pull-request

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