fix: abs() deprecation warning

Author: mrholek

scss/mixins/_grid.scss

@@ -56,7 +56,7 @@
 @mixin row-cols($count) {
   > * {
     flex: 0 0 auto;
-    width: divide(100%, $count);
+    width: percentage(divide(1, $count));
   }
 }
 

scss/mixins/_list-group.scss

@@ -6,7 +6,7 @@
 @mixin list-group-item-variant($state, $variant) {
   $background: map-get($variant, "bg");
   $background-hover: map-get($variant, "bg-hover");
-  $color: contrast-ratio-correction(map-get($variant, "color"), map-get($variant, "bg"), abs($alert-color-scale), $state);
+  $color: contrast-ratio-correction(map-get($variant, "color"), map-get($variant, "bg"), $alert-color-scale, $state);
 
   --#{$prefix}list-group-color: #{$color};
   --#{$prefix}list-group-bg: #{$background};