Update latest minor version to 9.9.0 (#26949)

Automatic Merge

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{
+	"9.9.0",
 	"9.8.0",
 	"9.7.0",
 	"9.6.0",