.arcconfig

clonebundles: add missing newline to legacy response

This seems to have been removed in 6.5 (likely by 60f9602b413e).

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