tools/cmake: update to 4.1.2

tools/cmake: update to 4.1.2

Update cmake to 4.1.2.
Note that cmake 4.x requires at least 3.5 as 'cmake_minimum_required'
in CMakeLists.txt of each app to be compiled.

Future cmake versions will increase that requirement to 3.10
https://cmake.org/cmake/help/latest/command/cmake_minimum_required.html

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Link: https://github.com/openwrt/openwrt/pull/20265
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>