CI: Allow the vs2019-x64 job to fail; there is something wrong with the harfbuzz build.

Part-of: <https://gitlab.gnome.org/GNOME/librsvg/-/merge_requests/991>

Author: federicomenaquintero

.gitlab-ci.yml

@@ -417,6 +417,7 @@ vs2019-x64:
     paths:
       - "${CI_PROJECT_DIR}/msvc-build/meson-logs"
       - "${CI_PROJECT_DIR}/msvc-build/tests/output"
+  allow_failure: true
 
 distcheck:
   stage: acceptance test