chore: update supported versions in security policy

Author: nkaradzhov

SECURITY.md

@@ -5,10 +5,12 @@
 Node Redis is generally backwards compatible with very few exceptions, so we recommend users to always use the latest version to experience stability, performance and security.
 
 | Version | Supported          |
-|---------|--------------------|
-| 4.0.z   | :heavy_check_mark: |
-| 3.1.z   | :heavy_check_mark: |
-| < 3.1   | :x:                |
+| ------- | ------------------ |
+| 8.2.z   | :heavy_check_mark: |
+| 8.0.z   | :heavy_check_mark: |
+| 7.4.z   | :heavy_check_mark: |
+| 7.2.z   | :heavy_check_mark: |
+| < 7.2   | :x:                |
 
 ## Reporting a Vulnerability