docs: add phpini null value changelog

Author: Will-thom

user_guide_src/source/changelogs/v4.7.4.rst

@@ -32,6 +32,7 @@ Bugs Fixed
 
 - **Database:** Fixed a bug where ``updateBatch()`` could be called after Query Builder ``where()`` conditions, even though it's not supported. In this situation, now the ``DatabaseException`` is thrown.
 - **HTTP:** Fixed a bug where the User Agent library reported Safari's WebKit version instead of the browser version from the ``Version`` token.
+- **Security:** Fixed a bug where ``CheckPhpIni`` could raise a type error when ``ini_get_all()`` returned ``null`` for a configured directive value.
 
 See the repo's
 `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_