chore(deps): update ghcr.io/ublue-os/silverblue-main:latest docker digest to 2181a76 (#4101)

Co-authored-by: ubot-7274[bot] <217212047+ubot-7274[bot]@users.noreply.github.com>

Author: ubot-7274[bot]

image-versions.yml

@@ -2,7 +2,7 @@ images:
   - name: silverblue-main
     image: ghcr.io/ublue-os/silverblue-main
     tag: latest
-    digest: sha256:9e81ecd01ca1ee7541453e067e70d048f61793bd350988666d6730afac5dc2dd
+    digest: sha256:2181a76cc459823c97569c5acf717eb46798637f30fb6d8b8bc50ddafb78d440
   - name: common
     image: ghcr.io/projectbluefin/common
     tag: latest