docs: Generate changelog for v5.2.0-build.1

changes/v5.2.0-build.1.en.md

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+# v5.2.0-build.1
+
+## Enhancements
+
+- [#11568](https://github.com/emqx/emqx/pull/11568) Added support for defining templates for MQTT publish properties in Republish rule action.
+
+
+
+## Bug Fixes
+
+- [#11568](https://github.com/emqx/emqx/pull/11568) Fixed an issue where an ill-defined builtin rule action config could be interpreted as a custom user function.