DB2Exception doesn't implement the DriverException interface

[morozov]

Q	A
BC Break	no
Version	2.10.2

Summary

The fact that the class doesn't implement the interface makes it impossible to work with the driver in a portable way (i.e. to catching a specific interface and use the error code and SQLSTATE).

Current behaviour

dbal/lib/Doctrine/DBAL/Driver/IBMDB2/DB2Exception.php

Lines 5 to 12 in fedac50

	use Exception;
	/**
	* @psalm-immutable
	*/
	class DB2Exception extends Exception
	{
	}

[morozov]

Closed via #4085.

[github-actions]

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