chore: Bump fontawesome from 6.5.2 to 6.6.0

- bump @fortawesome/fontawesome-svg-core from 6.5.2 to 6.6.0
- bump @fortawesome/free-regular-svg-icons from 6.5.2 to 6.6.0
- bump @fortawesome/free-solid-svg-icons from 6.5.2 to 6.6.0

config/importmap.rb

@@ -10,9 +10,9 @@
 pin "flatpickr", to: "https://ga.jspm.io/npm:flatpickr@4.6.13/dist/flatpickr.js"
 pin "flatpickr/dist/plugins/monthSelect", to: "https://ga.jspm.io/npm:flatpickr@4.6.13/dist/plugins/monthSelect/index.js"
 pin "flatpickr/dist/l10n/ja", to: "https://ga.jspm.io/npm:flatpickr@4.6.13/dist/l10n/ja.js"
-pin "@fortawesome/fontawesome-svg-core", to: "https://ga.jspm.io/npm:@fortawesome/fontawesome-svg-core@6.5.2/index.mjs"
-pin "@fortawesome/free-regular-svg-icons", to: "https://ga.jspm.io/npm:@fortawesome/free-regular-svg-icons@6.5.2/index.mjs"
-pin "@fortawesome/free-solid-svg-icons", to: "https://ga.jspm.io/npm:@fortawesome/free-solid-svg-icons@6.5.2/index.mjs"
+pin "@fortawesome/fontawesome-svg-core", to: "https://ga.jspm.io/npm:@fortawesome/fontawesome-svg-core@6.6.0/index.mjs"
+pin "@fortawesome/free-regular-svg-icons", to: "https://ga.jspm.io/npm:@fortawesome/free-regular-svg-icons@6.6.0/index.mjs"
+pin "@fortawesome/free-solid-svg-icons", to: "https://ga.jspm.io/npm:@fortawesome/free-solid-svg-icons@6.6.0/index.mjs"
 pin "emoji-toolkit", to: "https://ga.jspm.io/npm:emoji-toolkit@8.0.0/lib/js/joypixels.js"
 pin "js-cookie", to: "https://ga.jspm.io/npm:js-cookie@3.0.5/dist/js.cookie.mjs"
 pin_all_from "app/javascript/controllers", under: "controllers"