Bumps fontawesome to latest (#88791)

## About The Pull Request
Bumps our fontawesome icons to 6.7.2. I suspicion some of these will
look or work differently with 516/webview2 (perhaps how they were
intended) because FontAwesome dropped IE support some time ago.
## Why It's Good For The Game
Dependency bump + new icons
## Changelog
🆑
add: TGUI icons are updated to latest FontAwesome version, v6.7.2.
/🆑

html/font-awesome/README.MD

@@ -1,6 +1,4 @@
-Due to the fact browse_rsc can't create subdirectories, every time you update font-awesome you'll need to change relative webfont references in all.min.css
-eg ../webfonts/fa-regular-400.ttf => fa-regular-400.ttf (or whatever you call it in asset datum)
+Due to the fact browse_rsc can't create subdirectories, every time you update font-awesome you'll need to ensure the relative webfont references in all.min.css
+are correct eg ../webfonts/fa-regular-400.ttf => fa-regular-400.ttf (or whatever you call it in asset datum)
 
-Second change is ripping out file types other than ~~ woff and eot(ie8)~~  ttf from the css
-
-Finally, removing brand related css.
+Finally, removing brand related css. You can do this by formatting the css, removing them manually (or some regex?) and then minifying it.