nicer error for boa not connecting

[PatrickAlphaC]

mox run deploy --network anvil --private-key xxxx
Running run command...
Traceback (most recent call last):
  File "/Users/patrick/.local/share/uv/tools/moccasin/lib/python3.11/site-packages/urllib3/connection.py", line 199, in _new_conn
    sock = connection.create_connection(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/patrick/.local/share/uv/tools/moccasin/lib/python3.11/site-packages/urllib3/util/connection.py", line 85, in create_connection
    raise err
  File "/Users/patrick/.local/share/uv/tools/moccasin/lib/python3.11/site-packages/urllib3/util/connection.py", line 73, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 61] Connection refused

The above exception was the direct cause of the following exception:

We probably should catch this