SVG parsing - comparing the tag name in a case insensitive way

This patch will avoid bypassing the uri validation if the tag name have some uppercased letters.

Author: Blaklis

Diff for: src/Image/Cache.php

@@ -133,7 +133,7 @@ static function resolve_url($url, $protocol, $host, $base_path, Options $options
                 xml_set_element_handler(
                     $parser,
                     function ($parser, $name, $attributes) use ($options, $parsed_url, $full_url) {
-                        if ($name === "image") {
+                        if (strtolower($name) === "image") {
                             $attributes = array_change_key_case($attributes, CASE_LOWER);
                             $url = $attributes["xlink:href"] ?? $attributes["href"];
                             if (!empty($url)) {