fix: decoder error preventing succesfull app subprocess restart (#34879)

.changeset/cool-planes-protect.md

...s-engine/src/server/runtime/deno/AppsEngineDenoRuntime.ts

...es/apps-engine/src/server/runtime/deno/LivenessManager.ts

...s/apps-engine/src/server/runtime/deno/ProcessMessenger.ts

packages/apps-engine/src/server/runtime/deno/codec.ts