Merge topic 'cmp0168-populate-nondeclare-regression' into release-3.30

cbb727ca6b FetchContent: Don't update verify script timestamp if it doesn't change
795e7b44f2 Help: file(CONFIGURE) only updates output file timestamp if it changes

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !9799