chore(deps): update dependency font-awesome to v6.6.0 #4554

Job	Run time
Collect suggests deps	9s
Smoke test: stock R	6m 41s
Collect versions	10s
Check suggests deps	0s
macos-latest (4.4)	4m 25s
macos-latest (4.3)	4m 27s
windows-latest (devel)	8m 7s
ubuntu-22.04 (release)	8m 12s
Without ${{ matrix.package }}	0s
pkgdown	11m 31s
windows-latest (4.4)	9m 40s
windows-latest (4.3)	14m 31s
ubuntu-22.04 (devel)	54m 20s
ubuntu-22.04 (4.4)	5m 48s
ubuntu-22.04 (4.3)	6m 2s
ubuntu-22.04 (4.2)	6m 34s
ubuntu-22.04 (4.1)	6m 52s
ubuntu-22.04 (4.0)	6m 10s
ubuntu-22.04 (4.4) with covr	7m 2s
ubuntu-22.04 (release) SQL Server with covr	6m 15s
ubuntu-22.04 (release) Postgres with covr	6m 18s
ubuntu-22.04 (release) MariaDB with covr	5m 52s
ubuntu-22.04 (release) MySQL with covr	6m 17s
ubuntu-22.04 (release) DuckDB with covr	6m 38s
ubuntu-22.04 (release) SQLite with covr	6m 0s
	3h 18m 1s

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