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