Update dependency node-fetch to v2.6.9

This MR 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

Compare Source

Bug Fixes

• "global is not defined" (#​1704) (70f592d)

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