Move our macOS builds to Debian Stretch
In #29307 (moved) we switched the host of our Windows builds from Debian Jessie to Stretch. We should do the same for macOS builds. We should have this done for Tor Browser 9, I think.
In #29307 (moved) we switched the host of our Windows builds from Debian Jessie to Stretch. We should do the same for macOS builds. We should have this done for Tor Browser 9, I think.