chore: bump image tags to v0.3.19

Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>

Author: VGSML

k8s/cluster/values.yaml

@@ -121,7 +121,7 @@ defaults:
 management:
   image:
     repository: ghcr.io/hugr-lab/automigrate
-    tag: v0.3.18
+    tag: v0.3.19
     pullPolicy: IfNotPresent
 
   cluster:
@@ -134,7 +134,7 @@ management:
 workNode:
   image:
     repository: ghcr.io/hugr-lab/server
-    tag: v0.3.18
+    tag: v0.3.19
     pullPolicy: IfNotPresent
 
   replicas: 3