Update cmake min required version

[pjdixit]

This line CMakeLists file throws below warning
cmake_minimum_required(VERSION 3.9)

Its desired that cmake min required version is updated.

CMake Deprecation Warning at C:/Dev/Projects/External/here-data-sdk-cpp/CMakeLists.txt:18 (cmake_minimum_required):
Compatibility with CMake < 3.10 will be removed from a future version of
CMake.

Update the VERSION argument value. Or, use the ... syntax
to tell CMake that the project requires at least but has been updated
to work with policies introduced by or earlier.