Downgrade Mercurial to 3.4.2 due to https://github.com/galaxyproject/galaxy/issues/1183 .
Downgrade Mercurial to 3.4.2 due to https://github.com/galaxyproject/galaxy/issues/1183 .

natefoo/starforge,natefoo/starforge,galaxyproject/starforge,bgruening/docker-build,galaxyproject/starforge,bgruening/docker-build