chore(dev): bump iceberg-rest-fixture to latest

There is no published `apache/iceberg-rest-fixture:1.11.0` image (Docker Hub
only has up to `1.10.1` plus `latest`), and the `1.10.x` images predate the
server-side scan-planning support that landed on `main` in late 2025. Use the
`latest` tag, a recent `main` build that includes the 1.11.x server-side
features, so the integration tests can exercise them (e.g. server-side scan
planning, #1690).

Mirrors apache/iceberg-python#3389, which likewise drops the version pin to pick
up the 1.11.x fixture.

Author: huan233usc

dev/docker-compose.yaml

@@ -80,7 +80,7 @@ services:
   # REST Catalog - Apache Iceberg REST Catalog
   # =============================================================================
   rest:
-    image: apache/iceberg-rest-fixture:1.10.0
+    image: apache/iceberg-rest-fixture:latest
     environment:
       - AWS_ACCESS_KEY_ID=admin
       - AWS_SECRET_ACCESS_KEY=password