Address Deprecation Warning for global-builtin

[askmrsinh]

Addresses warnings like:

   ╷
15 │   #{$css-var-prefix}current-version-checkmark: #{mix($jade-450, $zinc-750)};
   │                                                  ^^^^^^^^^^^^^^^^^^^^^^^^^
   ╵
    node_modules/.pnpm/@picocss+picocss.com@https+++codeload.github.com+picocss+picocss.com+tar.gz+c6864890939_993ae236b4494a641ef7a87e2ca7e199/node_modules/@picocss/picocss.com/app/styles/scss/commons/theme/default/_light.scss 15:50  theme()
    node_modules/.pnpm/@picocss+picocss.com@https+++codeload.github.com+picocss+picocss.com+tar.gz+c6864890939_993ae236b4494a641ef7a87e2ca7e199/node_modules/@picocss/picocss.com/app/styles/scss/commons/theme/_default.scss 21:3         @use
    node_modules/.pnpm/@picocss+picocss.com@https+++codeload.github.com+picocss+picocss.com+tar.gz+c6864890939_993ae236b4494a641ef7a87e2ca7e199/node_modules/@picocss/picocss.com/app/styles/scss/main.scss 7:1                            @use
    src/styles/global.scss 1:1                                                                                                                                                                                                             root stylesheet

Deprecation Warning [global-builtin]: Global built-in functions are deprecated and will be removed in Dart Sass 3.0.0.
Use color.mix instead.

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