fix: bump tower -> 0.76.4 (smoke-gate Promote ↑)

values.yaml

@@ -9,7 +9,7 @@ backend:
     # so every cluster that runs Tower needs the same imagePullSecret
     # provisioned out-of-band (until cluster-platform-v3 owns it).
     repository: registry.odoosky.cloud/odoosky/docker-mirror/tower
-    tag: "0.76.3"
+    tag: "0.76.4"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull
@@ -29,7 +29,7 @@ frontend:
   enabled: true
   image:
     repository: registry.odoosky.cloud/odoosky/docker-mirror/tower-ui
-    tag: "0.76.3"
+    tag: "0.76.4"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull