changelog: Add entry for updated .gitignore (#8380)

* changelog: Add entry for updated .gitignore

Adds an entry for https://github.com/FreshRSS/FreshRSS/pull/8372

* Fix Markdown

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Co-authored-by: Alexandre Alapetite <alexandre@alapetite.fr>

CHANGELOG.md

@@ -12,6 +12,8 @@ See also [the FreshRSS releases](https://github.com/FreshRSS/FreshRSS/releases).
 	* Disable counting articles in user labels for Ajax requests (unused) [#8352](https://github.com/FreshRSS/FreshRSS/pull/8352)
 * Security
 	* Change `Content-Disposition: inline` to `attachment` in `f.php` [#8344](https://github.com/FreshRSS/FreshRSS/pull/8344)
+* Extensions
+	* Update `.gitignore` to ignore installed extensions [#8372](https://github.com/FreshRSS/FreshRSS/pull/8372)
 
 
 ## 2025-12-24 FreshRSS 1.28.0