setup: use the same version of nixpkgs during updating dependencies
setup: use the same version of nixpkgs during updating dependencies

La0/mozilla-relengapi,garbas/mozilla-releng-services,garbas/mozilla-releng-services,srfraser/services,La0/mozilla-relengapi,garbas/mozilla-releng-services,mozilla-releng/services,lundjordan/services,lundjordan/services,La0/mozilla-relengapi,lundjordan/services,srfraser/services,La0/mozilla-relengapi,mozilla-releng/services,mozilla-releng/services,lundjordan/services,srfraser/services,mozilla-releng/services,srfraser/services,garbas/mozilla-releng-services