Drop versions of Node before 18.13

[benmccann]

Describe the problem

#8991 (comment)

kit/packages/kit/src/exports/node/polyfills.js

Line 24 in bfa2b6e

// TODO: remove this once we only support Node 18.11+ (the version multipart/form-data was added)

Describe the proposed solution

bump the engines field, conditionally polyfill as proposed in #10273, then remove polyfill option from adapter-node: https://kit.svelte.dev/docs/adapter-node#options-polyfill

I'm not exactly sure when globalThis.crypto was made available, but I think crypto may need to be polyfilled until Node 20

Alternatives considered

No response

Importance

nice to have

Additional Information

No response