Update dependency whatwg-fetch to v3.1.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
whatwg-fetch	dependencies	minor	3.0.0 -> 3.1.0

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Release Notes

github/fetch

v3.1.0

Compare Source

Documentation:

• Added documentation on features of fetch which are not polyfilled. -- #​734

Bug fixes:

• Empty header names used to not throw an error which was not compliant with the specification. They now throw a TypeError, the same as Chrome, Firefox and Safari do. -- #​684

• Changed the default status text of a response to align with the specification, the default is now an empty string. -- #​698

• We now allow exclamation mark as valid header character to align with the specification -- #​745

• We no longer convert application/octet-stream responses into Blobs if the browser supports ArrayBuffers -- #​752

• Added compatibility for fetch-mock -- #​736

• Making a fetch request with an empty string for the url no longer throws a DOMException error in Internet Explorer -- #​619

• Fixed another Internet Explorer bug to make sure all resolved fetch promises will trigger their promise chains -- #​575

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