Adding upstream version 5.3.6+dfsg.

Signed-off-by: Daniel Baumann <daniel@debian.org>

scss/_card.scss

@@ -206,13 +206,13 @@
         &:not(:last-child) {
           @include border-end-radius(0);
 
-          .card-img-top,
-          .card-header {
+          > .card-img-top,
+          > .card-header {
             // stylelint-disable-next-line property-disallowed-list
             border-top-right-radius: 0;
           }
-          .card-img-bottom,
-          .card-footer {
+          > .card-img-bottom,
+          > .card-footer {
             // stylelint-disable-next-line property-disallowed-list
             border-bottom-right-radius: 0;
           }
@@ -221,13 +221,13 @@
         &:not(:first-child) {
           @include border-start-radius(0);
 
-          .card-img-top,
-          .card-header {
+          > .card-img-top,
+          > .card-header {
             // stylelint-disable-next-line property-disallowed-list
             border-top-left-radius: 0;
           }
-          .card-img-bottom,
-          .card-footer {
+          > .card-img-bottom,
+          > .card-footer {
             // stylelint-disable-next-line property-disallowed-list
             border-bottom-left-radius: 0;
           }

scss/mixins/_banner.scss

@@ -1,6 +1,6 @@
 @mixin bsBanner($file) {
   /*!
-   * Bootstrap #{$file} v5.3.5 (https://getbootstrap.com/)
+   * Bootstrap #{$file} v5.3.6 (https://getbootstrap.com/)
    * Copyright 2011-2025 The Bootstrap Authors
    * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
    */

scss/mixins/_visually-hidden.scss

@@ -19,6 +19,11 @@
   &:not(caption) {
     position: absolute !important;
   }
+
+  // Fix to prevent overflowing children to become focusable
+  * {
+    overflow: hidden !important;
+  }
 }
 
 // Use to only display content when it's focused, or one of its child elements is focused