[chronik-client] Dockerfile back to latest

Summary:
Changing to @2.0.0 in the last diff did work. So, there is an issue with having this version potentially cached.

The solution is to run the docker build with --no-cache. However looking into it, docker-run.sh does not support this script. I am not sure why -- mb it just needs to be extended.

At the moment, keeping it @latest is better than keeping it pinned to 2.0.0. Will look to resolve the cache issue on docker build in CI.

Test Plan: docker build -f chronik-client.Dockerfile -t chronik-client_local .

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17377