[php-src] PR #23393: ext/pgsql: fix the class name casing of pg_close_stmt()'s connection

Pull Request: https://github.com/php/php-src/pull/23393 Author: lacatoire pg_close_stmt() declares its connection as Pgsql\Connection: ```php function pg_close_stmt(Pgsql\Connection $connection, string $statement_name): PgSql\Result|false {} ``` The class is PgSql\Connection, declared that way a few lines below in the same stub and spelled that way by the other thirty-one references in the generated arginfo. This was the only Pgsql left in the extension. Class name resolution is case-insensitive, so nothing breaks at runtime; what leaks is the declaration. On builds where the function exists (libpq >= 17), ReflectionParameter::getType() reports Pgsql\Connection for this one function and PgSql\Connection for every other. The return type on the same line already says PgSql\Result. pgsql_arginfo.h is regenerated: one ZEND_ARG_OBJ_INFO line plus the stub hash, and no Pgsql remains in the file. The added test needs no server: it reads the declared types through Reflection, prints pg_close_stmt() next to pg_connect_poll(), which takes the same non-nullable typed connection, and checks both against the class name. It skips where pg_close_stmt() is not compiled in.