Add End of life notice to 4.1 (#34383)

CHANGELOG.md

@@ -3,6 +3,11 @@ Changelog
 
 All notable changes to this project will be documented in this file.
 
+## End of life notice
+
+**The 4.1.x branch has reached its end of life and will not receive any further update.**
+This means that no security fix will be made available for this branch after this date, and you will need to update to a more recent version (such as the 4.3.x branch) to receive security fixes.
+
 ## [4.1.25] - 2025-04-02
 
 ### Add

SECURITY.md

@@ -13,9 +13,9 @@ A "vulnerability in Mastodon" is a vulnerability in the code distributed through
 
 ## Supported Versions
 
-| Version | Supported        |
-| ------- | ---------------- |
-| 4.3.x   | Yes              |
-| 4.2.x   | Yes              |
-| 4.1.x   | Until 2025-04-08 |
-| < 4.1   | No               |
+| Version | Supported |
+| ------- | --------- |
+| 4.3.x   | Yes       |
+| 4.2.x   | Yes       |
+| 4.1.x   | No        |
+| < 4.1   | No        |