[TASK] Drop obsolete Doctrine DBAL development dependency

As we are now using CSV assertions in the functional tests instead of
direct database queries, we do not require Doctrine DBAL in the
tests anymore.

composer.json

@@ -47,7 +47,6 @@
 		"typo3/cms-frontend": "^11.5.4 || ^12.4"
 	},
 	"require-dev": {
-		"doctrine/dbal": "^2.13.5 || ^3.6.2",
 		"ergebnis/composer-normalize": "^2.28.3",
 		"friendsofphp/php-cs-fixer": "^3.41.1",
 		"helmich/typo3-typoscript-lint": "^3.1.0",