.arcconfig

tests: update test-ssh.t output with --chg

The output change was caused by d7304434390f5efca405744fa12a6585edae3d83.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "phabricator.uri": "https://phab.mercurial-scm.org/",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}