backstage release v2.85.0-rc.1

Added

• (installations) Show each management cluster’s version in #2705 by @teemow

Fixed

• (agent-platform) Explain unpriced models against the gateway’s built-in catalogue in #2648 by @QuentinBisson

Full Changelog: https://github.com/giantswarm/backstage/compare/v2.84.0...v2.85.0-rc.1