sources: update mattermost to 5.39

nix/sources.json

@@ -24,18 +24,18 @@
         "owner": "mattermost",
         "repo": "mattermost-server",
         "rev": "28ef5856ed5f1c3cfb29a869cb6f14662f964ff3",
-        "sha256": "1vihpmy7253yl87arlz8y9rahk1q69blykwm3172dk1hxajr7c13",
+        "sha256": "0qcl32lidvwjrg8kil8a67141lnbrdx3hha0y9cwdlz8b6l8gxsz",
         "type": "tarball",
-        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v5.37.1.tar.gz",
+        "url": "https://github.com/mattermost/mattermost-server/archive/refs/tags/v5.39.0.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/refs/tags/v<version>.tar.gz",
-        "version": "5.37.1"
+        "version": "5.39.0"
     },
     "mattermost-webapp": {
-        "sha256": "00q1kcfda2z69ijpw71a6cbj76p5f57nj7pym44pp4cadi2wz180",
+        "sha256": "1dm7zswz61p1008hkz0c4maq8382p8iv5kmc4ivzlqd2hhixbvvg",
         "type": "tarball",
-        "url": "https://releases.mattermost.com/5.37.1/mattermost-5.37.1-linux-amd64.tar.gz",
+        "url": "https://releases.mattermost.com/5.39.0/mattermost-5.39.0-linux-amd64.tar.gz",
         "url_template": "https://releases.mattermost.com/<version>/mattermost-<version>-linux-amd64.tar.gz",
-        "version": "5.37.1"
+        "version": "5.39.0"
     },
     "mumble-website": {
         "branch": "master",