[chronik] bump karyon_jsonrpc

Summary:
The latest commit on the master branch of the karyon repo changes RPC errors to accept non-static strings. This enables more helpful error messages in RPC responses.

In this diff we bump the version and fix our code to account for this breaking change in API.

Test Plan: ninja check-functional

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Subscribers: Fabien

Differential Revision: https://reviews.bitcoinabc.org/D17496