fix File constraint tests on 32bit PHP

Author: xabbuh

Tests/Constraints/FileTest.php

@@ -101,8 +101,10 @@ public static function provideValidSizes()
             ['3M', 3000000, false],
             ['1gi', 1073741824, true],
             ['1GI', 1073741824, true],
-            ['4g', 4000000000, false],
-            ['4G', 4000000000, false],
+            ['2g', 2000000000, false],
+            ['2G', 2000000000, false],
+            ['4g', 4 === \PHP_INT_SIZE ? '4000000000' : 4000000000, false],
+            ['4G', 4 === \PHP_INT_SIZE ? '4000000000' : 4000000000, false],
         ];
     }