chore(event-bingo): update images to sha-6e90ff4

Author: github-actions[bot]

services/event-bingo/overlays/prod/kustomization.yaml

@@ -16,7 +16,7 @@ commonLabels:
 images:
 - name: ghcr.io/pseudo-lab/event-bingo-backend
   newName: ghcr.io/pseudo-lab/event-bingo-backend
-  newTag: sha-0fc5c1c
+  newTag: sha-6e90ff4
 - name: ghcr.io/pseudo-lab/event-bingo-frontend
   newName: ghcr.io/pseudo-lab/event-bingo-frontend
-  newTag: sha-0fc5c1c
+  newTag: sha-6e90ff4