Fix bug when detecting in-band notification warning while connection is

being created or actively used (oracle#383).

Preparing to release python-oracledb 2.4.0.

Preparing to release version 2.3.0.

Thick mode defers throwing the exception until a fetch is attempted.

Remove unused section header.

Preparing to release 2.1.2.

Remove unnecessary import.

Update ODPI-C to 5.2.0.

Preparing to release version 2.0.1.

Fix regression when using a connection type when creating a pool.