Update supported versions in SECURITY.md

Signed-off-by: Lala Sabathil <[email protected]>
(cherry picked from commit 283277e)

Author: Lulalaby

.github/SECURITY.md

@@ -5,7 +5,7 @@
 | Version | Supported          |
 | ------- | ------------------ |
 | 2.x     | :white_check_mark: |
-| <2.0.0  | :x:                |
+| <2.6.1  | :x:                |
 
 ## Reporting a Vulnerability