Update latest minor version to 9.8.0 (#26655)

Co-authored-by: unified-ci-app[bot] <121569378+unified-ci-app[bot]@users.noreply.github.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/version.go

@@ -13,6 +13,7 @@ import (
 // It should be maintained in chronological order with most current
 // release at the front of the list.
 var versions = []string{
+	"9.8.0",
 	"9.7.0",
 	"9.6.0",
 	"9.5.0",