Update dependency node-fetch to v2.6.9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
node-fetch	2.6.8 -> 2.6.9

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Release Notes

node-fetch/node-fetch

### [`v2.6.9`](https://togithub.com/node-fetch/node-fetch/releases/tag/v2.6.9) [Compare Source](https://togithub.com/node-fetch/node-fetch/compare/v2.6.8...v2.6.9) ##### Bug Fixes - "global is not defined" ([#​1704](https://togithub.com/bitinn/node-fetch/issues/1704)) ([70f592d](https://togithub.com/bitinn/node-fetch/commit/70f592d9d2da959df1cebc2dd2314286a4bcf345))

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