Fix signatures of PDO::pgsqlCopy{From,To}{Array,File} #1375
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These 4 methods have optional parameters,
delimiter,nullAsandfields.PDO::pgsqlCopyFromArrayPDO::pgsqlCopyFromFilePDO::pgsqlCopyToArrayPDO::pgsqlCopyToFileHowever, PHPStan complains when the optional arguments are missing.
https://phpstan.org/r/3efb4fa2-ac60-4444-899a-963c7989a466
This PR fixes the issue.