psutil: remove empty tuple from laddr

The PR that introduced this #6669
only showed results for `raddr`, not `laddr`

The documentation https://psutil.readthedocs.io/en/latest/#psutil.net_connections
says that `raddr` can be the empty tuple. It does not say that `laddr` can be the empty tuple.

Author: beauxq

stubs/psutil/psutil/_ntuples.pyi

@@ -57,7 +57,7 @@ class sconn(NamedTuple):
     fd: int
     family: AddressFamily
     type: SocketKind
-    laddr: addr | tuple[()]
+    laddr: addr
     raddr: addr | tuple[()]
     status: str
     pid: int | None