Symfony version(s) affected

6.1.0 and above

Description

Hello,

I'm getting an error when sanitizing a text with urls. I have multiple allowed hosts in my config, and thus html sanitization for urls fails with access to undefined keys when calling UrlSanitizer->matchAllowedHostParts.

# src/Symfony/Component/HtmlSanitizer/TextSanitizer/UrlSanitizer.php
private static function matchAllowedHostParts(array $uriParts, array $trustedParts): bool
    {
        // Check each chunk of the domain is valid
        foreach ($trustedParts as $key => $trustedPart) {
            if ($uriParts[$key] !== $trustedPart) {
                return false;
            }
        }

        return true;
    }

How to reproduce

Here is a way to reproduce the issue through HtmlSanitizer unit tests :

1. Open src/Symfony/Component/HtmlSanitizer/Tests/TextSanitizer/UrlSanitizerTest.php
2. Add the following test case :

        yield [
            'input' => 'https://trusted.com/link.php',
            'allowedSchemes' => ['http', 'https'],
            'allowedHosts' => ['subdomain.trusted.com', 'trusted.com'],
            'forceHttps' => false,
            'allowRelative' => false,
            'expected' => 'https://trusted.com/link.php',
        ];

3. Test fails with : 

4. Symfony\Component\HtmlSanitizer\Tests\TextSanitizer\UrlSanitizerTest::testSanitize with data set Switched to submodules #27 ('https://trusted.com/link.php', array('http', 'https'), array('subdomain.trusted.com', 'trusted.com'), false, false, 'https://trusted.com/link.php')
   Undefined array key 2

/home/stoakes/dev/symfony/src/Symfony/Component/HtmlSanitizer/TextSanitizer/UrlSanitizer.php:135
/home/stoakes/dev/symfony/src/Symfony/Component/HtmlSanitizer/TextSanitizer/UrlSanitizer.php:123
/home/stoakes/dev/symfony/src/Symfony/Component/HtmlSanitizer/TextSanitizer/UrlSanitizer.php:63
/home/stoakes/dev/symfony/src/Symfony/Component/HtmlSanitizer/Tests/TextSanitizer/UrlSanitizerTest.php:24

### Possible Solution

I would check that key exists before accessing it. Roughly : 

```php
private static function matchAllowedHostParts(array $uriParts, array $trustedParts): bool
    {
        // Check each chunk of the domain is valid
        foreach ($trustedParts as $key => $trustedPart) {
            if (array_key_exists($key, $uriParts) && $uriParts[$key] !== $trustedPart) {
                return false;
            }
        }

        return true;
    }

Additional Context

No response