fix(vite-node): invalidate source map cache

[hi-ogawa]

Description

• closes vite-node sourcemap changes not reflected after HMR #6642

This is a sort of stop gap to fix stale sourceMapCache if client/server lives in the same process (e.g. vite-node cli). Ideally, we should structure it like Vite 6 module runner to cache decoded source map on client, so we don't need to cache it globally. I'll explore that approach later, but I'm pushing this fix first.

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