Update localstack/localstack Docker tag to v3

Author: renovate[bot]

.github/workflows/test-positive.yml

@@ -20,7 +20,7 @@ jobs:
     needs: [setup]
     services:
       localstack:
-        image: localstack/localstack:1.4.0
+        image: localstack/localstack:3.4.0
         credentials:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_PASSWORD }}