fix: pino

[nigrosimone]

#fix #372

[nigrosimone]

@dimdenGD

The second commit is not related to the pino fix.

res-connection test was printing res.socket inside the end() callback plus res.writableFinished right after end(). Node changed when the socket is detached, so on Node 24 and 26.8 express prints the socket and false, while on Node 22 it printed null and true. The test failed on main too, before this PR.

Side note: a Node update alone can break it, and we only see it on the next PR. Maybe we could run the tests on a schedule (a montly cron on main), so we find this kind of drift when it happens.