v5.20.0

What's Changed

• [pre-commit.ci] pre-commit autoupdate by @pre-commit-ci[bot] in #453
• Drop py37 by @jburel in #454
• use ome channel to install Ice 3.6 by @jburel in #455
• Declare portalocker as external dependency by @sbesson in #457
• Avoid the creation of empty file annotations by @sbesson in #466
• Add change log for 5.20.0 by @knabar in #467
• Add MultipleFileField to handle and clean multiple files by @will-moore in #465

Full Changelog: v5.19.0...v5.20.0