This constant is not recognized by PHPStan, and besides the docs say
this:

> Prior to PHP 5.3.2 (PECL OCI8 1.4) use OCI_DEFAULT which is equivalent
to OCI_NO_AUTO_COMMIT.

See https://www.php.net/manual/en/function.oci-execute.php

The method is not used for anything else than skipping tests for specific drivers. Cross-driver portability should be established by drivers, not outside of them based on their name.

Fixes #2953.