Bump github.com/mattermost/mattermost-server/v5 from 5.39.0 to 5.39.3 (#1682)

Bumps [github.com/mattermost/mattermost-server/v5](https://github.com/mattermost/mattermost-server) from 5.39.0 to 5.39.3.
- [Release notes](https://github.com/mattermost/mattermost-server/releases)
- [Changelog](https://github.com/mattermost/mattermost-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mattermost/mattermost-server/compare/v5.39.0...v5.39.3)

---
updated-dependencies:
- dependency-name: github.com/mattermost/mattermost-server/v5
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

vendor/github.com/mattermost/mattermost-server/v5/model/version.go

@@ -13,6 +13,9 @@ import (
 // It should be maintained in chronological order with most current
 // release at the front of the list.
 var versions = []string{
+	"5.39.3",
+	"5.39.2",
+	"5.39.1",
 	"5.39.0",
 	"5.38.2",
 	"5.38.1",