fix(ssr): resolve .cjs file extensions

[ygj6]

fix #4452

Description

Currently vite uses require() to import module in ssr mode.

vite/packages/vite/src/node/ssr/ssrModuleLoader.ts

Line 173 in fb406ce

const mod = require(resolve(id, importer, root))

According to nodejs' doc, It is not possible to require() files that have the .mjs extension. Attempting to do so will throw an error.
So we can only include the .cjs file extension here.

Additional context

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What is the purpose of this pull request?

• Bug fix
• New Feature
• Documentation update
• Other

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