Add sass/css export into package.json to support scss pkg: imports & update dependencies

[mkszepp]

While updating the dependencies, I discovered that the Sass/style exports are missing from package.json.

Adding the SCSS exports enables support for importing SCSS via pkg: imports (for example, @use "pkg:ember-basic-dropdown"). This has been supported since Dart Sass v1.71.0: [Announcing pkg: Importers](https://sass-lang.com/blog/announcing-pkg-importers/?utm_source=chatgpt.com)

For Vite apps, you need the following setup:

import { defineConfig } from 'vite';
import { NodePackageImporter } from "sass-embedded";

export default defineConfig({
  css: {
    preprocessorOptions: {
      scss: {
        api: "modern-compiler",
        importers: [new NodePackageImporter()],
      },
    },
  },
  ...
});