Update dependency node-fetch to v2.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
node-fetch	devDependencies	patch	2.6.0 -> 2.6.1

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Release Notes

bitinn/node-fetch

### [`v2.6.1`](https://togithub.com/bitinn/node-fetch/releases/v2.6.1) [Compare Source](https://togithub.com/bitinn/node-fetch/compare/v2.6.0...v2.6.1) **This is an important security release. It is strongly recommended to update as soon as possible.** See [CHANGELOG](https://togithub.com/node-fetch/node-fetch/blob/master/docs/CHANGELOG.md#v261) for details.

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