New "Mixed Declarations" Sass behavior

Hi there!

Since Dart Sass 1.77.7, the behavior of mixed declarations has changed (more info: https://sass-lang.com/documentation/breaking-changes/mixed-decls/).

This results in several warnings from this package when compiling, like this one:

WARNING in ./app/app.scss
Module Warning (from ./node_modules/sass-loader/dist/cjs.js):
Deprecation Warning on line 10, column 4 of file:///Users/myuser/projects/myproject/node_modules/@nativescript/theme/scss/core/primitives/_headings.scss:10:4:
Sass's behavior for declarations that appear after nested
rules will be changing to match the behavior specified by CSS in an upcoming
version. To keep the existing behavior, move the declaration above the nested
rule. To opt into the new behavior, wrap the declaration in `& {}`.

More info: https://sass-lang.com/d/mixed-decls

10 |     font-weight: normal;

node_modules/@nativescript/theme/scss/core/primitives/_headings.scss 11:5  @import
node_modules/@nativescript/theme/scss/core/primitives/_index.scss 4:9      @import
node_modules/@nativescript/theme/scss/core/_index.scss 5:9                 @import
node_modules/@nativescript/theme/core.scss 8:9                             @import
app/app.scss 4:9                                                           root stylesheet

 @ ./app/main.js 2:0-20

It is easily solvable by moving declarations before nested rules. For instance:

BEFORE

.body,
.body2,
.footnote {
    @include colorize($color: secondary);
    font-weight: normal;
}

AFTER

.body,
.body2,
.footnote {
    font-weight: normal;
    @include colorize($color: secondary);
}

I can totally do this with a PR but I would like to know if it has a chance to be merged.

NativeScript / theme

New "Mixed Declarations" Sass behavior #302