swiftBicNumber() generates BIC codes with invalid country codes

[GJoffrey]

Summary

The swiftBicNumber() function in FakerPHP generates BIC codes where the 5th and 6th characters, which should represent a valid country code according to the ISO 3166-1 alpha-2 standard, are entirely random.
This leads to validation failures when using validators that check for valid country codes in BICs, such as the one provided by Symfony (#[Assert\Bic]) based on a full table of ISO 3166 country codes that can be found here: https://en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

Versions

	Version
PHP	8.3
fakerphp/faker	1.23.1

Possible solution:

Modify the swiftBicNumber() function to generate the country code segment (positions 5 and 6) using a list of valid ISO 3166-1 alpha-2 country codes. This could involve:

• Integrating an array of valid country codes into FakerPHP. (maybe Payment::$ibanFormats keys ?)
• Adjusting the BIC generation logic to select a random valid country code for the relevant positions.

Thank you for addressing this issue. Please let me know if you require any further information.