Update dependency @fortawesome/fontawesome-free to v5.15.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@fortawesome/fontawesome-free (source)	5.15.3 -> 5.15.4

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Release Notes

FortAwesome/Font-Awesome

v5.15.4

Compare Source

Changed

• Removed the tripadvisor brand icon by request of Tripadvisor
• Update bug, bullseye, drone, icons #​17800 #​17106 #​17730
• Update bootstrap, discord, figma, and font-awesome-* brand icons #​17436

Fixed

• Made font-family matching case-insensitive for SVG + JavaScript version of Font Awesome #​17860
• Corrected missing version hospital-user #​17435
• Removed useless .tgz file in @​fortawesome/fontawesome-pro and all @​fortawesome/pro-*-svg-icons

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