Add CHANGELOG entry

Author: amorde

CHANGELOG.md

@@ -8,7 +8,9 @@
 
 ##### Bug Fixes
 
-* None.  
+* Bump `rexml` dependency to address [CVE-2024-43398](https://www.ruby-lang.org/en/news/2024/08/22/dos-rexml-cve-2024-43398/).  
+  [Eric Amorde](https://github.com/amorde)
+  [#970](https://github.com/CocoaPods/Xcodeproj/pull/970)
 
 
 ## 1.25.0 (2024-08-07)