update security policy to mention 8.2.0 release

SECURITY.md

@@ -11,15 +11,16 @@ submissions, when describing the vulnerability (see https://mapserver.org/develo
 ## Supported Versions
 
 The MapServer PSC (Project Steering Committee) will release patches for security vulnerabilities 
-for the last release branch of the **two most recent release series** (such as 8.x, 7.x. 6.x, etc...). 
+for the last release branch of the **two most recent release series** (such as 8.x, 7.x, 6.x, etc...). 
 Patches will only be provided **for a period of three years** from the release date of the current series.
-For example, as 8.0 has been released, now only 8.0.x and 7.6.x will be supported/patched and 7.6.x will
-only be supported for three years from the date of the 8.0 series release.
+For example, as 8.2 has been released, now 8.2.x, 8.0.x, and 7.6.x will be supported/patched, and 7.6.x will
+only be supported for three years from the date of the 8.0 series release (until 2025-09-12).
 
 Currently, the following versions are supported:
 
 | Version | Supported          |
 | ------- | ------------------ |
+| 8.2.x   | :white_check_mark: |
 | 8.0.x   | :white_check_mark: |
 | 7.6.x   | :white_check_mark: |
 | 7.4.x   | :x:                |
@@ -28,8 +29,10 @@ Currently, the following versions are supported:
 | 6.4.x   | :x:                |
 | < 6.4   | :x:                |
 
-Note: _MapServer 8.0.0 was released on 2022-09-12._
-Note: _MapServer 7.0.0 was released on 2015-07-24._
+Note:
+- _MapServer 8.2.0 was released on 2024-07-08._
+- _MapServer 8.0.0 was released on 2022-09-12._
+- _MapServer 7.0.0 was released on 2015-07-24._
 
 ## Version Numbering: Explained