agent-platform release v4.16.0

Added

• (kagent) Anthropic prompt caching on for the platform’s ModelConfigs; the kagent line moves to v0.11.0-gs.15 (giantswarm/giantswarm#37788) in #464 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.15.6...v4.16.0