Drop --bs-accordion-btn-focus-border-color and deprecate $accordion-button-focus-border-color (#39560)

Co-authored-by: XhmikosR <[email protected]>

Author: julien-deramond

scss/_accordion.scss

@@ -20,7 +20,6 @@
   --#{$prefix}accordion-btn-icon-transform: #{$accordion-icon-transform};
   --#{$prefix}accordion-btn-icon-transition: #{$accordion-icon-transition};
   --#{$prefix}accordion-btn-active-icon: #{escape-svg($accordion-button-active-icon)};
-  --#{$prefix}accordion-btn-focus-border-color: #{$accordion-button-focus-border-color};
   --#{$prefix}accordion-btn-focus-box-shadow: #{$accordion-button-focus-box-shadow};
   --#{$prefix}accordion-body-padding-x: #{$accordion-body-padding-x};
   --#{$prefix}accordion-body-padding-y: #{$accordion-body-padding-y};
@@ -74,7 +73,6 @@
 
   &:focus {
     z-index: 3;
-    border-color: var(--#{$prefix}accordion-btn-focus-border-color);
     outline: 0;
     box-shadow: var(--#{$prefix}accordion-btn-focus-box-shadow);
   }

scss/_variables.scss

@@ -1383,7 +1383,9 @@ $accordion-transition:                    $btn-transition, border-radius .15s ea
 $accordion-button-active-bg:              var(--#{$prefix}primary-bg-subtle) !default;
 $accordion-button-active-color:           var(--#{$prefix}primary-text-emphasis) !default;
 
-$accordion-button-focus-border-color:     $input-focus-border-color !default;
+// fusv-disable
+$accordion-button-focus-border-color:     $input-focus-border-color !default; // Deprecated in v5.3.3
+// fusv-enable
 $accordion-button-focus-box-shadow:       $btn-focus-box-shadow !default;
 
 $accordion-icon-width:                    1.25rem !default;