Apply `at-mixin-argumentless-call-parentheses: always` stylelint rule

scss/_dropdown.scss

@@ -10,7 +10,7 @@
   white-space: nowrap;
 
   // Generate the caret automatically
-  @include caret;
+  @include caret();
 }
 
 // The dropdown menu

scss/_images.scss

@@ -6,7 +6,7 @@
 // which weren't expecting the images within themselves to be involuntarily resized.
 // See also https://github.com/twbs/bootstrap/issues/18178
 .img-fluid {
-  @include img-fluid;
+  @include img-fluid();
 }
 
 
@@ -19,7 +19,7 @@
   @include box-shadow($thumbnail-box-shadow);
 
   // Keep them at most 100% wide
-  @include img-fluid;
+  @include img-fluid();
 }
 
 //

scss/_type.scss

@@ -71,12 +71,12 @@
 //
 
 .list-unstyled {
-  @include list-unstyled;
+  @include list-unstyled();
 }
 
 // Inline turns list items into inline-block
 .list-inline {
-  @include list-unstyled;
+  @include list-unstyled();
 }
 .list-inline-item {
   display: inline-block;

scss/helpers/_text.scss

@@ -3,5 +3,5 @@
 //
 
 .text-truncate {
-  @include text-truncate;
+  @include text-truncate();
 }

scss/mixins/_caret.scss

@@ -33,11 +33,11 @@
       vertical-align: $caret-vertical-align;
       content: "";
       @if $direction == down {
-        @include caret-down;
+        @include caret-down();
       } @else if $direction == up {
-        @include caret-up;
+        @include caret-up();
       } @else if $direction == right {
-        @include caret-right;
+        @include caret-right();
       }
     }
 
@@ -51,7 +51,7 @@
         margin-right: $caret-spacing;
         vertical-align: $caret-vertical-align;
         content: "";
-        @include caret-left;
+        @include caret-left();
       }
     }
 

site/static/docs/4.3/assets/scss/_brand.scss

@@ -10,7 +10,7 @@
   overflow: hidden;
   color: $bd-purple;
   background-color: #f9f9f9;
-  @include border-radius;
+  @include border-radius();
 
   .inverse {
     color: $white;
@@ -79,7 +79,7 @@
   height: 4rem;
   margin-right: .25rem;
   margin-left: .25rem;
-  @include border-radius;
+  @include border-radius();
 
   @include media-breakpoint-up(md) {
     width: 6rem;

site/static/docs/4.3/assets/scss/_callouts.scss

@@ -8,7 +8,7 @@
   margin-bottom: 1.25rem;
   border: 1px solid #eee;
   border-left-width: .25rem;
-  @include border-radius;
+  @include border-radius();
 
   h4 {
     margin-top: 0;
@@ -20,7 +20,7 @@
   }
 
   code {
-    @include border-radius;
+    @include border-radius();
   }
 
   + .bd-callout {

site/static/docs/4.3/assets/scss/_clipboard-js.scss

@@ -27,7 +27,7 @@
   color: #818a91;
   background-color: transparent;
   border: 0;
-  @include border-radius;
+  @include border-radius();
 
   &:hover {
     color: $white;