build: remove chrono package from depends Boost

Summary:

We no longer use Boost Chrono.

Backport of core PR18264.

Test Plan:

ninja all check-all

Run the Gitian builds

Reviewers: #bitcoin_abc, deadalnix

Reviewed By: #bitcoin_abc, deadalnix

Subscribers: deadalnix

Differential Revision: https://reviews.bitcoinabc.org/D7520