fix: remove 5.x support and update decode method signature #327
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See advisory: Firebase PHP-JWT key/algorithm type confusion
There's also an issue where the two versions of jwt-php have different method signatures for the
JWT::decodemethod. In version 6 supported algorithms are no longer given as a third parameter.JWK::parseKeySetalready returns a properly formatted array of keys.https://github.com/firebase/php-jwt/tree/main#using-jwks