Merge topic 'post-rel-dev'

a233f9fc0a Configure CMake itself with policies through CMake 4.2
5d5435c8ce export: Increase maximum policy version in exported files to 4.2
0d5069d5e8 Add deprecation warnings for policies CMP0155 and below

Acked-by: Kitware Robot <kwrobot@kitware.com>
Tested-by: buildbot <buildbot@kitware.com>
Merge-request: !11701