Merge pull request #532 from QIICR/workflows-improvements

GitHub workflows improvements

Merge pull request #527 from fedorov/deprecate-scikit

Deprecate scikit, simplify release process

cmake: Set DCMQI version to 1.5.1

Co-Authored-By: Claude Opus 4.6 <[email protected]>

cmake: Set DCMQI version to 1.5.1

Co-Authored-By: Claude Opus 4.6 <[email protected]>