Updated MDI Font to allow usage of way newer icons

[SeaLife]

Hey,

i updated the @mdi/font dependency to the newest which should break nothing but allow the usage of way newer icons :)

I wanted to use mdi-airplane-marker which was not available in 5.8.x

So, here i go, updating, tested it, seems to be working fine :)

[NGPixel]

There're about 100 icons that got either removed or renamed going from 5.x to 6.x, so this would be a breaking change.

[SeaLife]

Thats true https://github.com/Templarian/MaterialDesign/issues/5409 Is there a way to get this on to the main branch anyway? There is no way we could use both versions is there?

[funjoker]

how about adding a setting to select the version?