The following bit of replaced code contained a type inconsistency:

```py
attrs[SpanAttributes.NET_PEER_PORT] = int(data.get("port"))
```

`data.get` returns `Optional[str]` but `int(None)` throws a `TypeError`.

When using postgresql via unix socket `dsn` looks something like this:

```py
'user=postgres host=/tmp/socket dbname=postgres'
```

The `parse_dsn` function returns this:

```py
{'user': 'postgres', 'dbname': 'postgres', 'host': '/tmp/socket'}
```