chore: upgrade py 3.6 to 3.11

[dmeecs]

Seems to be going ok except when I run tox, it's giving me an error like so:

➜  cloudsmith-cli git:(chore/python-311) ✗ tox
Traceback (most recent call last):
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/py/_vendored_packages/apipkg.py", line 141, in __makeattr
    modpath, attrname = self.__map__[name]
                        ~~~~~~~~~~~~^^^^^^
KeyError: '__spec__'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/bin/tox", line 8, in <module>
    sys.exit(cmdline())
             ^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/tox/session.py", line 39, in main
    config = prepare(args)
             ^^^^^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/tox/session.py", line 27, in prepare
    config = parseconfig(args)
             ^^^^^^^^^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/tox/config.py", line 217, in parseconfig
    config = Config(pluginmanager=pm, option=option, interpreters=interpreters)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/tox/config.py", line 595, in __init__
    self.invocationcwd = py.path.local()
                         ^^^^^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/py/_vendored_packages/apipkg.py", line 148, in __makeattr
    result = importobj(modpath, attrname)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/py/_vendored_packages/apipkg.py", line 69, in importobj
    module = __import__(modpath, None, None, ['__doc__'])
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<frozen importlib._bootstrap>", line 1178, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1138, in _find_and_load_unlocked
  File "/Users/dmee/github/cloudsmith-cli/.venv/py3/lib/python3.11/site-packages/py/_vendored_packages/apipkg.py", line 146, in __makeattr
    raise AttributeError(name)
AttributeError: __spec__

which seems to be an issue with pytests 'py' dependency tox-dev/tox#2249

[chrisimcevoy]

@dmeecs closing this in favour of #136