Update dependency favicons to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
favicons	5.5.0 -> 6.2.1
@types/favicons	5.5.0 -> 6.2.1

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Release Notes

itgalaxy/favicons

v6.2.1

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Fixes

• update sharp and other deps
• add icon granularity to HTML code generation

v6.2.0

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Features

• granularity in icons options (#​312)

v6.1.0

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Features

• support 14 version of Node.js

v6.0.0

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Features:

• attempt to use appShortName for the apple home screen icon

Chore:

• update sharp to 0.24.0

BRAKING CHANGE:

• minimum supported Node.js version is 10.13.0

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