docs(SECURITY): add v3 EOL (#2922)

Refs #2854 Refs https://swagger.io/blog/news/what-s-new-in-swaggerui-v4-and-swaggereditor-v4/
swagger-api · Feb 21, 2022 · 50ca294 · 50ca294
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diff --git a/SECURITY.md b/SECURITY.md
@@ -11,7 +11,8 @@ currently being supported with security updates.
 
 | Version  | Supported          | Notes                  |
 | -------- | ------------------ | ---------------------- |
-| 3.x      | :white_check_mark: |                        |
+| 4.x      | :white_check_mark: | |
+| 3.x      | :x:                | End-of-life as of December 2021 |
 | 2.x      | :x:                | End-of-life as of 2017 |
 
 ## Reporting a vulnerability