Fix security policy (#16248)

SECURITY.md

@@ -4,8 +4,9 @@
 
 | Version | Supported          |
 | ------- | ------------------ |
-| 3.1.x   | :white_check_mark: |
-| < 3.1   | :x:                |
+| 3.4.x   | :white_check_mark: |
+| 3.3.x   | :white_check_mark: |
+| < 3.3   | :x:                |
 
 ## Reporting a Vulnerability