ci: fix localstack startup (#16048)

LocalStack introduced an auth token requirement in recent versions —
https://blog.localstack.cloud/localstack-for-aws-release-2026-03-0/

This PR pins LocalStack to `4.14.0` — a version that does not have the
auth gate, so no token or bypass env var is needed.

Fixes those tests:
<img width="549" height="389" alt="image"
src="https://github.com/user-attachments/assets/1572371c-e959-4100-a0e2-068268c0b580"
/>

---
- To see the specific tasks where the Asana app for GitHub is being
used, see below:
  - https://app.asana.com/0/0/1213815640035521

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: r1tsuu

test/docker-compose.yml

@@ -124,7 +124,7 @@ services:
   # ── LocalStack (S3 emulator) ────────────────────────────────
   localstack:
     profiles: [all, storage]
-    image: localstack/localstack:latest
+    image: localstack/localstack:4.14.0
     container_name: localstack_demo
     ports:
       - '4563-4599:4563-4599'
@@ -133,6 +133,7 @@ services:
       - SERVICES=s3
       - DEBUG=1
       - DATA_DIR=/tmp/localstack/data
+
     volumes:
       - localstack_data:/var/lib/localstack
       - '/var/run/docker.sock:/var/run/docker.sock'