ci: move date to release body

Author: codgician

.github/workflows/build.yml

@@ -58,6 +58,6 @@ jobs:
           file: "result/*squashfs*.bin;result/*squashfs*.img*;result/*.manifest;*sha256sums"
           overwrite: true
           update_latest_release: true
-          default_release_name: "Weekly build: ${{ needs.setup.outputs.date }}"
-          update_release_body: ""
+          default_release_name: "Weekly build"
+          update_release_body: "${{ needs.setup.outputs.date }}"
           draft: false