Python 3.11 import problem

[rikirolly]

Importing the proxy
from cpppo.server.enip.get_attribute import proxy

I get the error:

code() argument 13 must be str, not int
  File "/workspace/app/main.py", line 46, in <module>
    from cpppo.server.enip.get_attribute import proxy
TypeError: code() argument 13 must be str, not int```

[djformby]

There is an open PR that should fix this issue

#110