Deprecate float mixins (#28104)

scss/mixins/_float.scss

@@ -2,10 +2,13 @@
 
 @mixin float-left {
   float: left !important;
+  @include deprecate("The `float-left` mixin", "v4.3.0", "v5");
 }
 @mixin float-right {
   float: right !important;
+  @include deprecate("The `float-right` mixin", "v4.3.0", "v5");
 }
 @mixin float-none {
   float: none !important;
+  @include deprecate("The `float-none` mixin", "v4.3.0", "v5");
 }

scss/utilities/_float.scss

+// stylelint-disable declaration-no-important
+
 @each $breakpoint in map-keys($grid-breakpoints) {
   @include media-breakpoint-up($breakpoint) {
     $infix: breakpoint-infix($breakpoint, $grid-breakpoints);
 
-    .float#{$infix}-left  { @include float-left; }
-    .float#{$infix}-right { @include float-right; }
-    .float#{$infix}-none  { @include float-none; }
+    .float#{$infix}-left  { float: left !important; }
+    .float#{$infix}-right { float: right !important; }
+    .float#{$infix}-none  { float: none !important; }
   }
 }