Update dependency @fortawesome/fontawesome-free to v6.4.0

This MR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@fortawesome/fontawesome-free (source)	6.2.1 -> 6.4.0

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Release Notes

FortAwesome/Font-Awesome

v6.4.0

Compare Source

Change log available at https://fontawesome.com/docs/changelog/

v6.3.0

Compare Source

Change log available at https://fontawesome.com/docs/changelog/

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