docs: add changelog

Author: kenjis

user_guide_src/source/changelogs/v4.5.0.rst

@@ -502,6 +502,8 @@ Deprecations
 - **FeatureTestTrait:** The feature that the ``call()`` and ``withRoutes()``
   methods accept the lowercase HTTP methods has been deprecated. Use correct
   uppercase HTTP methods instead.
+- **Database:** The ``BaseConnection::$strictOn`` has been deprecated. It will be
+  moved to ``MySQLi\Connection`` in the future.
 
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 Bugs Fixed