deps: address high-severity supply chain alerts (libp2p 0.56, quinn-proto, aws-lc, yamux)

- Bump libp2p 0.53 -> 0.56 (gossipsub/quic/yamux subcrate updates)
- quinn-proto 0.11.14; rustls/aws-lc-rs/aws-lc-sys to latest compatible
- yamux 0.13.x -> 0.13.10; adapt identify::Event::Received for new field
- Document residual yamux 0.12.1 via libp2p-yamux dual-range in security-dependency-updates.md

Made-with: Cursor

Author: TheNewAutonomy