[BUG] Error (auth/invalid-api-key) on hosting PR

### Action config

firebase-hosting-pull-request.yml
```
name: Deploy to Firebase Hosting on PR
'on': pull_request
jobs:
build_and_preview:
if: '${{ github.event.pull_request.head.repo.full_name == github.repository }}'
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v2
- run: npm ci && npm run build
- uses: FirebaseExtended/action-hosting-deploy@v0
with:
repoToken: '${{ secrets.GITHUB_TOKEN }}'
firebaseServiceAccount: '${{ secrets.FIREBASE_SERVICE_ACCOUNT_NEED_CODE }}'
projectId: need-code
```

### Error message

### Expected behavior

The auto PR preview link should be deployed without an error

Link: https://need-code--pr12-update-firebase-depl-7pxhj1zl.web.app/
### Actual behavior