v7.4.12

What's Changed

• added mixs slots req by submission schema to Biosample by @turbomam in #808
• more mixs slots and better testing by @turbomam in #810

Includes better testing of the jsonshema artifacts and fixes the workflow for adding MIxS slots to the Biosample class adn dynamically regenerating the mixs.yaml

Full Changelog: v.7.4.11...v7.4.12