Apply suggestions from code review

Author: ihor-sviziev

app/code/Magento/Theme/Block/Html/Footer.php

@@ -135,7 +135,9 @@ protected function getCacheLifetime()
     }
 
     /**
-     * Replace YYYY by the current year
+     * Replace YYYY with the current year
+     *
+     * @param string $text
      */
     private function replaceCurrentYear(string $text): string
     {

app/code/Magento/Theme/Test/Unit/Block/Html/FooterTest.php

@@ -25,6 +25,11 @@ class FooterTest extends TestCase
      */
     protected $block;
 
+    /**
+     * @var Config
+     */
+    private $scopeConfig;
+    
     protected function setUp(): void
     {
         $objectManager = new ObjectManager($this);