cmake: Up min version to 3.13

- As discussed in https://github.com/kamailio/kamailio/issues/4078#issuecomment-2553148148

CMakeLists.txt

@@ -1,4 +1,4 @@
-cmake_minimum_required(VERSION 3.10)
+cmake_minimum_required(VERSION 3.13)
 
 # Use cmake -DCMAKE_SYSTEM_NAME .. for cross-compiling (inside build directory)