Fix GH-13354: ext/pgsql: pg_execute, pg_send_query_params and_send_execute null value by reference.

For these, when passing null values by refence, queries return erroneous values unlike

Fix GH-13354: ext/pgsql: pg_execute, pg_send_query_params and_send_execute null value by reference.

For these, when passing null values by refence, queries return erroneous values unlike
pg_query_params behaving as expected.

close GH-13355.

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