Migrating AWS Lambda from Node.js 20 to 22 — every breaking change

AWS deprecates Lambda runtimes on a 3-phase schedule: Phase 1 ends security patches, Phase 2 blocks creating new functions, Phase 3 blocks updating existing ones. Once Phase 3 hits, a frozen function's only path forward is a full redeploy on a new runtime. nodejs20.x is on that track; nodejs22.x is