inngest@0.4.20

Fixes

• Fix syncs sometimes failing due to a JSON serialization issue.

What's Changed

• Add middleware order test by @amh4r in https://github.com/inngest/inngest-py/pull/201
• Fix nulls send in in-band sync response by @amh4r in https://github.com/inngest/inngest-py/pull/206

Full Changelog: https://github.com/inngest/inngest-py/compare/inngest@0.4.19...inngest@0.4.20