Merging upstream version 5.3.5+dfsg.

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

scss/mixins/_banner.scss

@@ -1,7 +1,7 @@
 @mixin bsBanner($file) {
   /*!
-   * Bootstrap #{$file} v5.3.3 (https://getbootstrap.com/)
-   * Copyright 2011-2024 The Bootstrap Authors
+   * Bootstrap #{$file} v5.3.5 (https://getbootstrap.com/)
+   * Copyright 2011-2025 The Bootstrap Authors
    * Licensed under MIT (https://github.com/twbs/bootstrap/blob/main/LICENSE)
    */
 }

scss/mixins/_grid.scss

@@ -72,7 +72,7 @@
     @include media-breakpoint-up($breakpoint, $breakpoints) {
       // Provide basic `.col-{bp}` classes for equal-width flexbox columns
       .col#{$infix} {
-        flex: 1 0 0%; // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
+        flex: 1 0 0;
       }
 
       .row-cols#{$infix}-auto > * {

scss/mixins/_visually-hidden.scss

@@ -24,7 +24,7 @@
 // Use to only display content when it's focused, or one of its child elements is focused
 // (i.e. when focus is within the element/container that the class was applied to)
 //
-// Useful for "Skip to main content" links; see https://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
+// Useful for "Skip to main content" links; see https://www.w3.org/WAI/WCAG22/Techniques/general/G1.html
 
 @mixin visually-hidden-focusable() {
   &:not(:focus):not(:focus-within) {