cmake: bump minimum version to 3.16

This matches the current support matrix (from 2024-12-17) [1] and quiets
a warning from recent (3.31.5) versions of cmake:

CMake Deprecation Warning at CMakeLists.txt:8 (cmake_minimum_required):
  Compatibility with CMake < 3.10 will be removed from a future version
  of CMake.

Change-Id: I959cacf7497d4320d7b62ba51fa6184665922810
1 file changed