Darken default dropdown active bg color to meet WCAG AA contrast ratio requirements

Signed-off-by: Christopher Ng <chrng8@gmail.com>

Author: Pytal

src/css/global/variables.css

@@ -54,7 +54,7 @@
     --vs-dropdown-option-padding: 3px 20px;
 
     /* Active State */
-    --vs-dropdown-option--active-bg: #5897fb;
+    --vs-dropdown-option--active-bg: #136CFB;
     --vs-dropdown-option--active-color: #fff;
 
     /* Deselect State */