Update bootstrap 4.6.1

WebCms/Content/bootstrap/_spinners.scss

@@ -10,12 +10,12 @@
   display: inline-block;
   width: $spinner-width;
   height: $spinner-height;
-  vertical-align: text-bottom;
+  vertical-align: $spinner-vertical-align;
   border: $spinner-border-width solid currentColor;
   border-right-color: transparent;
-  // stylelint-disable-next-line property-blacklist
+  // stylelint-disable-next-line property-disallowed-list
   border-radius: 50%;
-  animation: spinner-border .75s linear infinite;
+  animation: .75s linear infinite spinner-border;
 }
 
 .spinner-border-sm {
@@ -34,6 +34,7 @@
   }
   50% {
     opacity: 1;
+    transform: none;
   }
 }
 
@@ -41,15 +42,24 @@
   display: inline-block;
   width: $spinner-width;
   height: $spinner-height;
-  vertical-align: text-bottom;
+  vertical-align: $spinner-vertical-align;
   background-color: currentColor;
-  // stylelint-disable-next-line property-blacklist
+  // stylelint-disable-next-line property-disallowed-list
   border-radius: 50%;
   opacity: 0;
-  animation: spinner-grow .75s linear infinite;
+  animation: .75s linear infinite spinner-grow;
 }
 
 .spinner-grow-sm {
   width: $spinner-width-sm;
   height: $spinner-height-sm;
 }
+
+@if $enable-prefers-reduced-motion-media-query {
+  @media (prefers-reduced-motion: reduce) {
+    .spinner-border,
+    .spinner-grow {
+      animation-duration: 1.5s;
+    }
+  }
+}