chore(deps): update magnum digest to 272fd68 (#940)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
diff --git a/images/magnum/Earthfile b/images/magnum/Earthfile
index 52e0ac5..9094cdf 100644
--- a/images/magnum/Earthfile
+++ b/images/magnum/Earthfile
@@ -3,7 +3,7 @@
 ARG --global REGISTRY=ghcr.io/vexxhost/atmosphere
 ARG --global PROJECT=magnum
 ARG --global RELEASE=2023.2
-ARG --global PROJECT_REF=156f6f52d38a670e6fe10725966aeea4ddf65146
+ARG --global PROJECT_REF=272fd686d8c8bf5954e9e7d3bc991ff27e46184d
 
 build:
   FROM ../openstack-service+builder --RELEASE=${RELEASE}