[chronik] Bump karyon dependency to 0.3.4

Summary: It contains a bugfix that we need for the electrum interface to support large number of requests.

Test Plan:

./test/functional/test_runner.py chronik_electrum_*

Reviewers: #bitcoin_abc, PiRK

Reviewed By: #bitcoin_abc, PiRK

Subscribers: PiRK

Differential Revision: https://reviews.bitcoinabc.org/D18279