GHSA-6HXM-W4HV-VGVW Mattermost doesn't require role-management authorization when setting the scheme_admin flag on group syncable link and patch endpoints

Mattermost versions 11.6.x = 11.6.1, 11.5.x = 11.5.4, 10.11.x = 10.11.15, 10.11.x = 10.11.16 fail to require role-management authorization when setting the schemeadmin flag on group syncable link and patch endpoints, which allows a user with group-link permissions to escalate themselves and group...