Update dependency node-fetch to v2.7.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
node-fetch	2.6.7 -> 2.7.0
@types/node-fetch (source)	2.6.1 -> 2.6.6

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Release Notes

node-fetch/node-fetch (node-fetch)

v2.7.0

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Features

• AbortError (#​1744) (9b9d458)

v2.6.13

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Bug Fixes

• Remove the default connection close header (#​1765) (65ae25a), closes #​1735 #​1473 #​1736

v2.6.12

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Bug Fixes

• socket variable testing for undefined (#​1726) (8bc3a7c)

v2.6.11

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Reverts

• Revert "fix: handle bom in text and json (#​1739)" (#​1741) (afb36f6), closes #​1739 #​1741

v2.6.10

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Bug Fixes

• handle bom in text and json (#​1739) (29909d7)

v2.6.9

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Bug Fixes

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

v2.6.8

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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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