root: update security.md's supported versions (#17736)

Signed-off-by: Dominic R <dominic@sdko.org>

Author: dominic-r

SECURITY.md

@@ -18,10 +18,10 @@ Even if the issue is not a CVE, we still greatly appreciate your help in hardeni
 
 (.x being the latest patch release for each version)
 
-| Version   | Supported |
-| --------- | --------- |
-| 2025.6.x  | ✅        |
-| 2025.8.x  | ✅        |
+| Version    | Supported  |
+| ---------- | ---------- |
+| 2025.8.x   | ✅         |
+| 2025.10.x  | ✅         |
 
 ## Reporting a Vulnerability