fix: ErrorException is thrown if getimagesize() returns false

ErrorException
Trying to access array offset on value of type bool

system/Validation/FileRules.php

@@ -243,6 +243,12 @@ class FileRules
 
             // Get uploaded image size
             $info = getimagesize($file->getTempName());
+
+            if ($info === false) {
+                // Cannot get the image size.
+                return false;
+            }
+
             $fileWidth  = $info[0];
             $fileHeight = $info[1];