fix(deps): update dependency node-fetch to v2.6.8

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
node-fetch	2.6.7 -> 2.6.8

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Release Notes

node-fetch/node-fetch

v2.6.8

Compare Source

Bug Fixes

• headers: don't forward secure headers on protocol change (#​1605) (fddad0e), closes #​1599
• premature close with chunked transfer encoding and for async iterators in Node 12 (#​1172) (50536d1), closes #​1064 /github.com/node-fetch/node-fetch/pull/1064#issuecomment-849167400
• prevent hoisting of the undefined global variable in browser.js (#​1534) (8bb6e31)

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