[BUGFIX] Fix failing functional tests

Author: IchHabRecht

Tests/Functional/Controller/FlagResolver/PhpFileFlagResolverTest.php

@@ -58,7 +58,7 @@ public function closureFunctionIsApplied($filePattern)
         $this->assertNotEmpty($files);
 
         foreach ($files as $file => $fileContent) {
-            $this->assertStringContainsString('call_user_func(function () {', $fileContent);
+            $this->assertStringContainsString('call_user_func(static function () {', $fileContent);
         }
     }
 

Tests/Unit/FileCollection/PhpFileCollectionTest.php

@@ -61,6 +61,6 @@ public function getFilesCombinesPhpFileFlags()
 
         $this->assertArrayHasKey('ext_tables.php', $files);
         $this->assertContains('defined(\'TYPO3_MODE\') || die();', $files['ext_tables.php']);
-        $this->assertContains('call_user_func(function () {', $files['ext_tables.php']);
+        $this->assertContains('call_user_func(static function () {', $files['ext_tables.php']);
     }
 }