Tenant UI: Sass import deprecation warnings

[loneil]

As of updating to sass: 1.80.x as a dev dependency in the Tenant UI frontend warnings as below are outputting

Deprecation Warning: Sass @import rules are deprecated and will be removed in Dart Sass 3.0.0.

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

  ╷
1 │ @import "@/assets/variables.scss";
  │         ^^^^^^^^^^^^^^^^^^^^^^^^^
  ╵
    src\components\profile\issuance\Endorser.vue 1:9  root stylesheet

Should get these out of the way at some point as described here https://sass-lang.com/documentation/breaking-changes/import/