The transaction duration was notably off, doing:
```
curl localhost:3000/rpc/sleep?seconds=5 -i
```
Shows `46.1` for the `transaction;dur`, with this fix we obtain
`5007.3`.
Fixes https://github.com/PostgREST/postgrest/issues/4522
This also fixes inaccurate "schema cache queried" logs,
see https://github.com/PostgREST/postgrest/issues/4551.
(cherry picked from commit 013f078bc4)