agent-platform release v4.7.7

Fixed

• (substrate) Re-pin the line to v0.0.27-gs.3 — the ate.dev CRDs are kept on uninstall, so a cluster’s own Flux uninstalls the platform without racing substrate-crds in #390 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.7.6...v4.7.7