Change return url for repayment for guest, update SDK

[regdos]

No description provided.

[hostep]

@regdos, it should be if (PHP_VERSION_ID < 80000) { instead of if(PHP_VERSION_ID < 80500) {, as suggested in PayU-EMEA/openpayu_php#145

Because:

Note: This function has no effect. Prior to PHP 8.0.0, this function was used to close the resource.

So as of PHP 8.0, this function call doesn't do anything anymore. So no reason to call it.
Your current check will not cause issues, but it can be improved further.

[regdos]

@hostep you are right, i don't know why i added 80500