fix: make server type less restrictive (fix #17627)

[emilefokkema]

Description

This fixes #17627 by making the type of server and server less restrictive.

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[bluwy]

The changes looks fine to me, though I'm not sure if we need tests for this. I think it's fine to omit them.

I've not seen it mentioned, but I believe the inconvenient typing is because of this?

vite/packages/vite/src/node/server/index.ts

Line 224 in d454c8c

export type HttpServer = http.Server | Http2SecureServer

The https possibility interferes when passing the server.httpServer.

[emilefokkema]

@bluwy Exactly, that's where the inconvenience stems from.

Would you like me to remove the test I added?

[bluwy]

Yes please, and appreciate the effort making the test! If another maintainer prefers keeping the test still, I don't mind, but I think at the moment it's rare to break it again.