Mattermost Security Updates April 2023

Merge branch 'security-mattermost-2023-04-updates-15.11' into '15-11-stable'

See merge request gitlab-org/security/omnibus-gitlab!334

Changelog: security

config/software/mattermost.rb

@@ -18,10 +18,10 @@
 name 'mattermost'
-default_version '7.9.1'
+default_version '7.9.2'
 source url: "https://releases.mattermost.com/#{version}/mattermost-team-#{version}-linux-amd64.tar.gz",
-       sha256: 'fbad64313f66e0ad66a0aea3772150b2360c1fddaa1ba83ad63a84ba65b4860f'
+       sha256: 'f32d02679b15062b7d765514d2843096371d6df6df3c5ecf9a37963777ade418'
 relative_path 'mattermost'
 license_name = 'GITLAB-MATTERMOST-COMPILED-LICENSE.txt'