Update PROJECT_NUMBER doxygen

Author: tony-josi-aws

docs/doxygen/config.doxyfile

@@ -48,7 +48,7 @@ PROJECT_NAME           = FreeRTOS-Plus-TCP
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER         = V4.2.0
+PROJECT_NUMBER         = V4.3.0
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a