agent-platform-standalone release v0.40.0

Added

• Update component pins — muster 5.13.0 (OAuth fixes, core-tool annotations), backstage 0.241.1 (compact Tools step, flat Agents table) in #182 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform-standalone/compare/v0.39.1...v0.40.0