Add the BCHN network AUR packages to the automated version bump

Summary: Make the PKGBUILD for these repo be updated when the version change.

Test Plan: Not sure how to test that, but this is trivial enough.

Reviewers: #bitcoin_abc, jasonbcox

Reviewed By: #bitcoin_abc, jasonbcox

Differential Revision: https://reviews.bitcoinabc.org/D8312