Move to python 3.8 minimum

[cmsirbu]

Drops support for Python 3.7 and updates poetry.lock.

FIXES:

nautobot_ssot/filters.py:32:0: R0022: Useless option value for 'disable', 'no-self-use' was moved to an optional extension, see https://pylint.readthedocs.io/en/latest/whatsnew/2/2.14/summary.html#removed-checkers. (useless-option-value)

INFO     -  DeprecationWarning: invalid escape sequence '\/'
              File
            "/home/vagrant/.cache/pypoetry/virtualenvs/nautobot-ssot-SCbO3rSM-py3.10/lib/python3.10/site-packages/griffe/agents/visitor.py",
            line 179, in get_module
                top_node = compile(self.code, mode="exec", filename=str(self.filepath), flags=ast.PyCF_ONLY_AST,
            optimize=1)
              File "nautobot_ssot/integrations/aci/diffsync/utils.py", line 36, in
                pattern = "tn-(.+?)\/"  # noqa: W605  # pylint: disable=anomalous-backslash-in-string
INFO     -  DeprecationWarning: invalid escape sequence '\-'
              File
            "/home/vagrant/.cache/pypoetry/virtualenvs/nautobot-ssot-SCbO3rSM-py3.10/lib/python3.10/site-packages/griffe/agents/visitor.py",
            line 179, in get_module
                top_node = compile(self.code, mode="exec", filename=str(self.filepath), flags=ast.PyCF_ONLY_AST,
            optimize=1)
              File "nautobot_ssot/integrations/aci/diffsync/utils.py", line 42, in
                pattern = "ap-[A-Za-z0-9\-]+"  # noqa: W605 # pylint: disable=anomalous-backslash-in-string

TODO:

• Fix new pylint errors due to the major version bump unconstrained by python 3.7
• Possibly bump minimum nautobot version to 1.5.13 (which is tested by CI)

[jdrew82]

Closing as this is address by #207.