Make Doctrine DBAL 4 middleware integration compatible with current driver signatures

[javihgil]

ConnectionTracerMiddleware is not compatible with current Doctrine DBAL 4 driver signatures.

Current problems:

• beginTransaction(), commit(), and rollBack() declare bool returns while DBAL 4 middleware expects void
• PHPStan reports covariance and return-type errors
• the class may fail or behave inconsistently when the middleware branch is actually loaded in DBAL 4 environments

This should be fixed in a way that keeps the bundle usable across the supported DBAL versions.