Upgrade localstack to 3.5.0

We were having issues with errors on pdf-converter where the v2 AWS API
was trying to be used but was causing errors. Upgrading fixed them.

Something like:

localstack.aws.protocol.parser.ProtocolParserError: Operation detection failed. Missing Action in request for query-protocol service ServiceModel(sqs)

docker-compose.yml

@@ -1,6 +1,6 @@
 services:
   localstack:
-    image: localstack/localstack:2.3.2
+    image: localstack/localstack:3.5.0
     network_mode: bridge
     environment:
       SERVICES: lambda,sns,s3,sqs,iam