chore python upgrade

[b1r3k]

• chore: update pyenv python version to 3.11
• fixes: dependencies broken on python 3.11
• fixes: flake errors detected on newer version of flake8
• fixes: test cases after upgrading lxml 4.x
• chore: upgrade syntax to python 3.11 using pyupgrade
• chore: replace nose2 with pytest
• fixes: SetuptoolsDeprecationWarning: Invalid dash-separated options
• fixes: UserWarning: Unknown distribution option: 'tests_require'
• fixes: error in ks-email-parser setup command: 'extras_require' must be a dictionary whose values are strings or lists
• Revert "fixes: UserWarning: Unknown distribution option: 'tests_require'"

fixes #74