Bump @types/node to ^20.4.2

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@types/node (source)	^18.16.19 -> ^20.4.2

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[mui-bot]

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[siriwatknp]

No ts errors, so I think this is safe to be merged. cc @mui/code-infra

[Janpot]

Ideally @types/node major/minor versions are aligned with the Node.js version we are running on. See https://github.com/definitelytyped/definitelytyped#how-do-definitely-typed-package-versions-relate-to-versions-of-the-corresponding-library
It doesn't matter that much as the APIs are usually backwards compatible, but the @tyeps/node may contain features that are not available yet on the Node.js version we use.

I'm not sure however whether there's an easy way to sync Node.js with @types/node in renovate bot.

[Janpot]

Actually, looks like they have a preset for this

"extends": ["helpers:disableTypesNodeMajor"]

[ZeeshanTamboli]

Last week, I closed this update and Renovate indicated it would ignore the update (#37793 (comment)). However, it seems that is not true. MUI X has locked the version to 18 in mui/mui-x#9107, and I was planning to do the same. Please refer to the discussion in #37793.