Swagger tooling Wikibase REST API uses e.g. for the autodocs page has recently received new versions which include OpenAPI 3.1.0 support, see e.g. https://github.com/swagger-api/swagger-ui/releases/tag/v5.0.0
Our specification is likely not immediately benefiting massively from the new OpenAPI standard parts. It still seems sensible to update the underlying tooling to the recent major versions.
As long as the tooling update does not involve fundamental changes to how we use it (e.g. how we build the specification file, how we generate autodocs file) we will attempt the update