Update dependency whatwg-fetch to v3.6.2

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
whatwg-fetch	^3.5.0 -> 3.6.2

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Release Notes

github/fetch

v3.6.2

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v3.6.1

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Bug fixes:

• Fixes a bug in v3.6.0 where the syntax used was not ES3 as it has used const
• Fixes a bug in v3.6.0 where String.prototype.includes was used, which is not supported in IE 11

Both were fixed in https://github.com/github/fetch/pull/914

v3.6.0

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Bug fixes:

• Improve error message if a header contains an invalid character -- https://github.com/github/fetch/pull/880 Thank you for the contribution @​CarmeloPatti

• Make Response.statusText be an empty string if set to undefined and be 'null' if set to null -- https://github.com/github/fetch/pull/897 Thank you for the contribution @​tkrotoff

• Represent non-stringified JSON request body as an [object Object] string -- https://github.com/github/fetch/pull/881 Thank you for the contribution @​kettanaito

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