fixed static test failures

Author: engcom-Echo

app/code/Magento/Catalog/Ui/DataProvider/Product/Listing/Collector/Price.php

@@ -23,16 +23,16 @@
 class Price implements ProductRenderCollectorInterface
 {
     /** FInal Price key */
-    const KEY_FINAL_PRICE = "final_price";
+    public const KEY_FINAL_PRICE = "final_price";
 
     /** Minimal Price key */
-    const KEY_MINIMAL_PRICE = "minimal_price";
+    public const KEY_MINIMAL_PRICE = "minimal_price";
 
     /** Regular Price key */
-    const KEY_REGULAR_PRICE = "regular_price";
+    public const KEY_REGULAR_PRICE = "regular_price";
 
     /** Max Price key */
-    const KEY_MAX_PRICE = "max_price";
+    public const KEY_MAX_PRICE = "max_price";
 
     /**
      * @var PriceCurrencyInterface