Remove deprecated fa-caret-down styles

app/assets/stylesheets/fontawesome_custom.scss

@@ -27,10 +27,6 @@
   font-size: 2em;
 }
 
-.fa-caret-down::before {
-  content: '\f0d7';
-}
-
 .fa-exclamation-triangle::before {
   content: '\f071';
 }

app/assets/stylesheets/framework/buttons.scss

@@ -231,16 +231,6 @@
     color: $gray-700;
   }
 
-  .fa-caret-down {
-    margin-left: 5px;
-  }
-
-  &.dropdown-toggle {
-    .fa-caret-down {
-      margin-left: 3px;
-    }
-  }
-
   &.btn-text-field {
     width: 100%;
     text-align: left;

app/assets/stylesheets/pages/issues.scss

@@ -201,14 +201,6 @@ ul.related-merge-requests > li {
       }
     }
   }
-
-  .create-merge-request-dropdown-toggle {
-    .fa-caret-down {
-      pointer-events: none;
-      color: inherit;
-      margin-left: 0;
-    }
-  }
 }
 
 .discussion-reply-holder {

app/assets/stylesheets/pages/projects.scss

@@ -148,15 +148,6 @@
       fill: $layout-link-gray;
     }
 
-    .fa-caret-down {
-      margin-left: 3px;
-      line-height: 0;
-
-      &.dropdown-btn-icon {
-        margin-left: 0;
-      }
-    }
-
     .notifications-icon {
       top: 1px;
       margin-right: 0;