CMake: bump boxed-cpp to v1.4.3

Signed-off-by: Christian Parpart <[email protected]>

Author: christianparpart

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(boxed-cpp VERSION 1.4.2 LANGUAGES CXX)
+project(boxed-cpp VERSION 1.4.3 LANGUAGES CXX)
 list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)