chore: sync with main

core/src/components/checkbox/checkbox.scss

@@ -194,7 +194,7 @@ input {
    * the checkbox should be on the end
    * when the label sits at the start.
    */
-  @include margin(0, 8px, 0, 0);
+  @include margin(0, $form-control-label-margin, 0, 0);
 }
 
 
@@ -215,7 +215,7 @@ input {
  * when the label sits at the end.
  */
 :host(.checkbox-label-placement-end) .label-text-wrapper {
-  @include margin(0, 0, 0, 8px);
+  @include margin(0, 0, 0, $form-control-label-margin);
 }
 
 
@@ -228,7 +228,7 @@ input {
    * the checkbox should be on the end
    * when the label sits at the start.
    */
-  @include margin(0, 8px, 0, 0);
+  @include margin(0, $form-control-label-margin, 0, 0);
 }
 
 /**