chore(deps): update octavia digest to 3f31a50 (#906)

diff --git a/images/octavia/Earthfile b/images/octavia/Earthfile
index c55144c..0fcb0d5 100644
--- a/images/octavia/Earthfile
+++ b/images/octavia/Earthfile
@@ -2,7 +2,7 @@
 
 ARG --global PROJECT=octavia
 ARG --global RELEASE=2023.2
-ARG --global PROJECT_REF=88d7315a60314e44fcce88ad198ceb3c0c107fe6
+ARG --global PROJECT_REF=3f31a50f264c0e58691b1be7e90d324c13588b63
 
 build:
   FROM ../openstack-service+builder --RELEASE=${RELEASE}