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Remove return types due to backward compatibility

Co-authored-by: Ihor Sviziev <ihor-sviziev@users.noreply.github.com>

Author: tufahu

lib/internal/Magento/Framework/Escaper.php

@@ -289,7 +289,7 @@ public function escapeUrl($string)
      * @return string
      * @since 101.0.0
      */
-    public function encodeUrlParam(string $string): string
+    public function encodeUrlParam(string $string)
     {
         return $this->getEscaper()->escapeUrl($string);
     }
@@ -328,7 +328,7 @@ function ($matches) {
      * @return string
      * @since 101.0.0
      */
-    public function escapeCss(string $string): string
+    public function escapeCss(string $string)
     {
         return $this->getEscaper()->escapeCss($string);
     }