once itk 5.2 is released, requirements.txt needs to be updated and the warning message removed.

this is a follow up of

• ITKReader does not read NRRD05 images with 'measurement frame' field #1451
• Throw warning when reading NRRD05 files to upgrade to ITK >= 5.2 #1602
• Need to transpose array obtained from itk instead of reversing of itk.size() in ITKReader #1357 (comment)
• DICOM not loading #1713

see also:
https://github.com/InsightSoftwareConsortium/ITK/tags