agent-platform release v4.7.3

Changed

• (ci) The test-ingress-modes tool-install step bounds and retries its network calls (apt with timeout, helm download with curl retries) so a stalled mirror fails fast instead of hanging into CircleCI’s 10-minute no-output timeout in #382 by @teemow

Full Changelog: https://github.com/giantswarm/agent-platform/compare/v4.7.2...v4.7.3