[v1.3.0] Update CMock submodule pointer (#114)

Author: moninom1

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## v1.3.0 (August 2024)
 
 ### Changes
+ - [#114](https://github.com/FreeRTOS/coreMQTT-Agent/pull/114) Update CMock submodule pointer to latest version v2.5.3.
  - [#111](https://github.com/FreeRTOS/coreMQTT-Agent/pull/111) Update coreMQTT-Agent to work with the coreMQTT v2.3.1.
  - [#110](https://github.com/FreeRTOS/coreMQTT-Agent/pull/110) Fix MISRA violation.
  - [#109](https://github.com/FreeRTOS/coreMQTT-Agent/pull/109) Update CMakeList optionally build UT/Coverity & Update Coverity configuration.

manifest.yml

@@ -12,7 +12,7 @@ dependencies:
       path: source/dependency/coreMQTT
 
   - name: "CMock"
-    version: "3b443e5"
+    version: "v2.5.3"
     repository:
       type: "git"
       url: " https://github.com/ThrowTheSwitch/CMock.git"