fix(node-adapter): set cache header for non-immutable build assets

[TorstenDittmann]

When serving client files, ensure non-immutable assets are never cached by browsers by setting a maxage=0 cache header.

When no cache-control header is set, browsers will still cache files and with /_app/version.json and /_app/env.js this causes a lot of issues when deploying new versions using the node adapter.

Similiar to what is done here https://github.com/sveltejs/kit/blob/main/packages/kit/src/runtime/server/respond.js#L291-L294

Related issues: #9089 #13799

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Latest commit: 46c5757

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@sveltejs/adapter-node	Patch

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