fix(admin-ui): Correct the warning about the division in Sass (#1294)

Closes #1293

packages/admin-ui/src/lib/static/styles/global/_utilities.scss

@@ -1,7 +1,9 @@
+@use "sass:math";
+
 // spacing
 $space-unit: 6px;
 
-$space-1: $space-unit / 2;
+$space-1: math.div($space-unit, 2);
 $space-2: $space-unit;
 $space-3: $space-unit * 2;
 $space-4: $space-unit * 3;