packet@v4.2.0

What's new

• Publish solana-packet v4.2.0
• Zero-initialize buffer in Packet::default (#810) by @plutohan
• Add wincode serialization support (#812) by @kskalski
• Add StableAbi to public types (#806) by @kskalski
• Deprecate track_performance markers from packets (#602) by @alexpyattaev