Update dependency font-awesome to v5.15.3

[renovate]

This PR contains the following updates:

Package	Update	Change
font-awesome (source)	minor	5.14.0 -> 5.15.3

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Release Notes

FortAwesome/Font-Awesome

v5.15.3

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Changed

• Updated air-freshener's design due to trademark violation notice

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v5.15.2

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Changed

• Support release to improve Font Awesome Kits performance

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v5.15.1

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Changed

• Update to the ravelry brand icon

Fixed

• Removed fill attribute from the vest and vest-patches icon
• Moved attribution comment to correct location for sprites
• Fixed duotone icons not rendering in Kits

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v5.15.0

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Minor version upgrade notice: there are some backward-incompatible changes to this release. See the
UPGRADING.md guide for more
information.

Added

• Added guilded, hive, innosoft, instalod, ns8, octopus-deploy, perbyte,
  uncharted, watchman-monitoring, wodu sponsored brand icons
• Added commissioned vest and vest-patch icon
• Added cloudflare brand icon

Changed

• Removed the adobe icon at the request of Adobe
• Update rocketchat brand icon

Fixed

• Conflict detection now includes Kits when checking for conflicts

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