ci(uffizzi-preview): provide GitHub token to download artifacts (#10005)

GitHub token is required to download artifacts from another workflow
run.

Reference: https://github.com/actions/download-artifact/issues/320
Fixes: 62e1485143 ("ci(uffizzi-preview): use id of the workflow that triggered the workflow run (#10003)")
Fixes: 2684cedddf ("chore(release-pr): update `upload-artifact` action to v4 (#9859)")

Signed-off-by: Eng Zer Jun <engzerjun@gmail.com>

.github/workflows/uffizzi-preview.yml

@@ -19,12 +19,14 @@ jobs:
       action: ${{ steps.event.outputs.ACTION }}
     steps:
       - name: 'Download artifacts'
-        # Fetch output (zip archive) from the workflow run that triggered this workflow.
+        # Download artifacts from the workflow run that triggered this workflow.
+        # Token is required to download from a different workflow run.
         uses: actions/download-artifact@v4
         with:
           path: preview-spec
           pattern: preview-spec-*
           merge-multiple: true
+          github-token: ${{ github.token }}
           run-id: ${{ github.event.workflow_run.id }}
 
       - name: 'Accept event from first stage'