ci: replace token with graycore token

Author: damienwebdev

.github/workflows/release-please.yml

@@ -11,6 +11,6 @@ jobs:
  steps:
  - uses: google-github-actions/release-please-action@v4
  with:
- token: ${{ secrets.MAGE_OS_CI_TOKEN }}
+ token: ${{ secrets.GRAYCORE_GITHUB_TOKEN }}
  command: manifest
  default-branch: main