chore: add support for version 2.19.x in SECURITY.md

Author: alirezanet

SECURITY.md

@@ -6,9 +6,9 @@ The following versions of the project are currently supported with security upda
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 2.19.x  | :white_check_mark: |
 | 2.18.x  | :white_check_mark: |
 | 2.17.x  | :white_check_mark: |
-| 2.16.x  | :white_check_mark: |
 | < 2.12  | :x:                |
 
 ## Reporting a Vulnerability