Update dependency whatwg-fetch to v3.6.20

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
whatwg-fetch	3.6.2 -> 3.6.20

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Release Notes

github/fetch (whatwg-fetch)

v3.6.20

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Bug Fixes

• Response.error().ok === false (#​1412) (27e1c75)

v3.6.19

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Bug Fixes

• Have unique error messages for xhr timeouts and errors (#​1380) (7170f0b)

v3.6.18

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• Fix - File fetching broken since commit 0c1d2b9 #1375
• Remove broken links 1dc07c6
• automatically generate a changelog 0e7d1dd

v3.6.17

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20 July 2023

• Revert "Resolves https://github.com/JakeChampion/fetch/issues/928" #928

v3.6.16

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18 July 2023

• Resolves https://github.com/JakeChampion/fetch/issues/928 #928

v3.6.15

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18 July 2023

• fix https://github.com/JakeChampion/fetch/issues/997 #997

v3.6.14

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18 July 2023

• Fix https://github.com/JakeChampion/fetch/issues/1076 #1076

v3.6.13

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18 July 2023

• respect charset within readBlobAsText #1059

v3.6.12

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18 July 2023

• fix: Headers only accepts array which have nested array of length 2 #1235

v3.6.11

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18 July 2023

• Define Body.arrayBuffer even if support.blob is false #992

v3.6.10

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18 July 2023

• use globals if they exist dffc542

v3.6.9

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18 July 2023

• fix: when no body supplied, do not set bodyUsed to true 7d92dff

v3.6.8

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18 July 2023

• validate status is in range #1213

v3.6.7

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18 July 2023

• dont shadow global #1026
• dont use github eslint 408d3b6
• remove invalid-headers test e3f6590
• Update lock.yml permissions e97321b

v3.6.6

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18 July 2023

• fix: ignore not throw on invalid response headers #930

v3.6.5

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18 July 2023

• Add some missed methods which should be normalized as uppercase a43b628
• Update caniuse link to use HTTPS and new pattern fb5b0cf

v3.6.4

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18 July 2023

• always set a signal on Request d1d09fb

v3.6.3

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18 July 2023

• Compatible global equals to the false 7727e50

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