Update dependency whatwg-fetch to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
whatwg-fetch	dependencies	major	^2.0.3 -> ^3.0.0

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Release Notes

github/fetch

v3.0.0

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• The whatwg-fetch package is now a module with exports. The following methods/classes are available:

  • fetch
  • Headers
  • Request
  • Response
  • DOMException

  All exports except for DOMException represent the polyfill implementations, not the native variants if they are available.

  This library still automatically acts like a polyfill if native window.fetch is unavailable; there is currently no way to use it as a ponyfill.

• Change credentials default value omit → same-origin to match the updated spec.

• fetch() and new Request() now accept the signal parameter to accept an AbortSignal.

• Join multiple header values with ,<space> instead of , to match other browsers.

• Convert any Request/Response unsupported body type to a string to match the spec.

• Flow type definitions are now included in the package.

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