Deprecation warnings in build

[ann-kilzer]

Describe the bug
Dart Sass deprecation warnings in the build logs

To Reproduce
Steps to reproduce the behavior:

1. Run yarn serve
2. Look at the logs
3. See warning:

Deprecation Warning: Using / for division outside of calc() is deprecated and will be removed in Dart Sass 2.0.0.

Recommendation: math.div($grid-gutter, 6) or calc($grid-gutter / 6)

More info and automated migrator: https://sass-lang.com/d/slash-div

   ╷
63 │     'sm': $grid-gutter / 6,
   │           ^^^^^^^^^^^^^^^^
   ╵
    node_modules/vuetify/src/styles/settings/_variables.scss 63:11         @import
    node_modules/vuetify/src/styles/settings/_index.sass 1:9               @import
    node_modules/vuetify/src/styles/styles.sass 2:9                        @import
    node_modules/vuetify/src/components/VDataIterator/_variables.scss 2:9  @import
    stdin 1:9                                                              root stylesheet

Expected behavior
It would be great if that would not happen.

Additional context
This could be solved by upgrading to #261 ... I think we might be on an older version of Vuetify that is not playing nicely with new Sass rules