Bump Python requirement arkindex-base-worker to 0.4.0

.gitlab-ci.yml

.pre-commit-config.yaml

Dockerfile

README.md

pyproject.toml

tests/conftest.py

tests/test_archives_import.py

tests/test_image_import.py

tests/test_transkribus_folder_and_element.py

tests/test_transkribus_import.py

worker_file_import/iiif.py

worker_file_import/image.py

worker_file_import/page_xml.py

worker_file_import/pdf.py

worker_file_import/transkribus.py

worker_file_import/utils.py

worker_file_import/worker.py