Merge topic 'fix-IS_NEWER_THAN-usage' into release-3.20

b0da6712 FetchContent: Don't update timestamps if files don't change
404cddb7 ExternalProject: Fix misuse of IS_NEWER_THAN in timestamp checks

Acked-by: Kitware Robot <kwrobot@kitware.com>
Merge-request: !5825
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