windows-ci: temporarily allow Windows jobs to fail We have unfortunately ran out of free credit on the runners we were using from OVH for the Windows CI. We will be disabling the two remaining ones on the 30th of September, hence we need the CI to pass even if Windows jobs cannot start as a temporary measure. Hopefully we can find another way of getting Windows runners soon. Differential Revision: https://phab.mercurial-scm.org/D11499