Update SECURITY.md

Author: ivanwilliammd

SECURITY.md

@@ -9,8 +9,8 @@ To support this library long term, it was considered to use current PHP version
 | 8.3.x   | :white_check_mark: |
 | 8.2.x   | :white_check_mark: |
 | 8.1.x   | :white_check_mark: |
-| 8.0.x   | :question: (need volunteer to test) |
-| 7.4.x   | :question: (need volunteer to test) |
+| 8.0.x   | :white_check_mark: |
+| 7.4.x   | :white_check_mark: |
 
 ## Reporting a Vulnerability