priority-pass: bump image_tag to 88f18e53 [ci skip]

Auto-committed by ViktorBarzin/priority-pass GHA on push to main.
Source: 88f18e532b

stacks/priority-pass/terragrunt.hcl

@@ -21,5 +21,5 @@ inputs = {
   # priority-pass repo HEAD — auto-bumped by GHA `build-and-deploy.yml`
   # on every successful build. Manual edits welcome for local trials,
   # but CI will overwrite on the next push to main.
-  image_tag = "7c01448d"
+  image_tag = "88f18e53"
 }