fix: allow Node 18 again to make Stackblitz work (#1544)

.changeset/good-ants-fix.md

.github/workflows/test.yml

e2e/node/embedding/clip.e2e.ts

packages/env/src/internal/multi-model/node.ts

packages/llamaindex/package.json

packages/workflow/package.json

packages/workflow/src/workflow-context.ts

packages/workflow/tsconfig.json

pnpm-lock.yaml