cmake: add CMake configure dependency for VERSION file

Fixes: #56235

Changes to the Zephyr VERSION file is not picked up by CMake and thus
not picked up by Kconfig which may rely on the KERNELVERSION setting.

Fix this by setting CMAKE_CONFIGURE_DEPENDS on the Zephyr VERSION file.

Signed-off-by: Torsten Rasmussen <Torsten.Rasmussen@nordicsemi.no>