Merge topic 'post-rel-dev'

f8db82ba81 Configure CMake itself with policies through CMake 3.31
34652be5d2 export: Increase maximum policy version in exported files to 3.31
5cd2669146 Add deprecation warnings for policies CMP0142 and below

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !10296