fix: revert math.div SASS fallback

src/sass/lib/functions.scss

@@ -1,29 +1,3 @@
-@use 'sass:math';
-@use 'sass:meta';
-@use 'sass:list';
-
 @function to-percentage($input) {
   @return $input * 1%;
 }
-
-// Private polyfill for the `math.div` function from Sass to be used until we can update the
-// minimum required Sass version to 1.34.0 or above.
-// TODO: replace with `math.div` eventually.
-@function div($a, $b) {
-  @if (meta.function-exists('div', 'math')) {
-    @return math.div($a, $b);
-  } @else {
-    @return $a / $b;
-  }
-}
-
-// Private polyfill for the `list.slash` function from Sass to be used until we can update the
-// minimum required Sass version to 1.34.0 or above.
-// TODO: replace with `list.slash` eventually.
-@function slash($a, $b) {
-  @if (meta.function-exists('slash', 'list')) {
-    @return list.slash($a, $b);
-  } @else {
-    @return #{$a}#{' / '}#{$b};
-  }
-}