fix: use Object.defineProperty for Headers proxy

[kettanaito]

• Propagate from fix(ClientRequest): use Object.defineProperty when recording raw headers interceptors#638
• Fixes TypeError: Cannot assign to read only property 'Headers' of object '[object Object]' #2281
• Fixes TypeError: Cannot assign to read only property 'Request' of object '[object Window]' #2276

[kettanaito]

Released: v2.4.7 🎉

This has been released in v2.4.7!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

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