ci: Switch to https://flakestry.dev/publish

Author: srid

.github/workflows/flakestry.yaml

@@ -20,4 +20,3 @@ jobs:
             - uses: flakestry/flakestry-publish@main
               with:
                 version: "${{ inputs.tag || github.ref_name }}"
-                url: "https://staging.flakestry.dev"