chore(deps): update manila digest to a9cea65 (#957)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
diff --git a/images/manila/Earthfile b/images/manila/Earthfile
index 0bdadbf..be2bccb 100644
--- a/images/manila/Earthfile
+++ b/images/manila/Earthfile
@@ -2,7 +2,7 @@
 
 ARG --global PROJECT=manila
 ARG --global RELEASE=2023.2
-ARG --global PROJECT_REF=98bc755673fe48a9c67203e4262315b048efe25d
+ARG --global PROJECT_REF=a9cea65b45f0c0bf148b6ac9db0a8141c74fa2a6
 
 build:
   FROM ../openstack-service+builder --RELEASE=${RELEASE}