fix(slider): add labelledby to slider div (#11798)

* fix(slider): add labelledby to slider div

* chore(slider): update aria-labelledby

Author: aledavila

packages/react/src/components/Slider/Slider.js

@@ -632,6 +632,7 @@ export default class Slider extends PureComponent {
                     aria-valuemin={min}
                     aria-valuenow={value}
                     style={thumbStyle}
+                    aria-labelledby={labelId}
                   />
                   <div
                     className={`${prefix}--slider__track`}