Upgrade to Doctrine DBAL 4 and ORM 3

[dmaicher]

No description provided.

[dmaicher]

Will check how to get rid of this deprecation

   44x: Doctrine\DBAL\Connection::setNestTransactionsWithSavepoints is deprecated and will be removed in 5.0 (Connection.php:948 called by App_KernelTestDebugContainer.php:611, https://github.com/doctrine/dbal/pull/5383, package doctrine/dbal)
    10x in BlogControllerTest::setUp from App\Tests\Controller\Admin
    5x in DefaultControllerTest::tearDown from App\Tests\Controller
    4x in BlogControllerTest::testNewComment from App\Tests\Controller
    2x in AddUserCommandTest::testCreateUserNonInteractive from App\Tests\Command
    2x in AddUserCommandTest::testCreateUserInteractive from App\Tests\Command
    

[dmaicher]

Needs dmaicher/doctrine-test-bundle#281 first

[dmaicher]

Also see phpstan/phpstan#10573

Using non-empty-string to avoid

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  Line   src/Security/PostVoter.php                                                           
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  37     Asserted type string for $attribute with type string does not narrow down the type.  
 ------ ------------------------------------------------------------------------------------- 

[javiereguiluz]

I thought this would require more changes on our side, so I'm happy it doesn't. David, thanks a lot for taking care of this ... and also for making the needed updates in your great doctrine-test-bundle