v1.39.3

Important This is a mandatory update for all node operators. Please upgrade at your earliest convenience. Release notes A patch release on top of 1.39.2 with reliability and hardening fixes across block processing, networking, and request decoding. No consensus or database-format changes, so it's a drop-in upgrade from any 1.39.x version. Overview 3 changes since 1.39.2: Hardened ABI decoding…