Replace deprecated `PDO::MYSQL_*` constant usage with the driver-specific
`Pdo\Mysql::ATTR_*` constants introduced in PHP 8.4.
This prepares the code for PHP 8.5, where accessing MySQL driver constants
through the generic `PDO` class is deprecated.
This change requires a compatibility shim on older PHP versions to provide
`Pdo\Mysql` for runtimes that do not expose the driver-specific class yet. The
shim is provided in `ipl-sql`.
Still hacky, but at least the combined str_replace
should compensate the preg_replace :D
I stopped thinking about a proper fix, as between the
time the original quick fix was implemented and now,
nothing has fundamentally changed in ipl-orm.
fixes#1330
