Update ChangeLog

Author: sebastianbergmann

ChangeLog-10.5.md

@@ -4,6 +4,7 @@ All notable changes of the PHPUnit 10.5 release series are documented in this fi
 
 ## [10.5.20] - 2024-MM-DD
 
+* [#5771](https://github.com/sebastianbergmann/phpunit/issues/5771): JUnit XML logger may crash when test that is run in separate process exits unexpectedly
 * [#5819](https://github.com/sebastianbergmann/phpunit/issues/5819): Duplicate keys from different data providers are not handled properly
 
 ## [10.5.19] - 2024-04-17