This update for tiff fixes the following issues:

- Updated TIFFMergeFieldInfo() with read_count=write_count=0 for FIELD_IGNORE (bsc#1243503)
- CVE-2025-8176: Fixed heap use-after-free in tools/tiffmedian.c (bsc#1247108)
- CVE-2025-8177: Fixed possible buffer overflow in tools/thumbnail.c:setrow() 
  when processing malformed TIFF files (bsc#1247106)
- Add -DCMAKE_POLICY_VERSION_MINIMUM=3.5 to fix FTBFS with cmake4
- Add %check section
- Remove Group: declarations, no longer used