It would be beneficial to have some of the latest REST API changes in the REL1_43 release. In particular, this includes, but is not limited to, the following changes:
- T377578: Fix incorrect JSON pointers to root element in error responses
- Improvements to the OpenAPI Schema (T322917)
- Enabling the CreateProperty endpoint (T342992)
It may be easier to backport all recent changes of the wikibase.git master branch rather than cherry-picking specific REST API commits.