Admin API /v1/cluster/uuid returns additional chars

[JFlath]

Version & Environment

Redpanda version: (use rpk version): 23.2.17

What went wrong?

$ curl localhost:9644/v1/cluster/uuid
{"cluster_uuid": "{{9722a164-329b-4c17-8b03-e3109f0e9196}}"}

What should have happened instead?

$ curl localhost:9644/v1/cluster/uuid
{"cluster_uuid": "9722a164-329b-4c17-8b03-e3109f0e9196"}

How to reproduce the issue?

rpk container start
docker exec -it rp-node-0 bash
curl localhost:9644/v1/cluster/uuid