MyPy flagged linting issues

[ModeSevenIndustrialSolutions]

Do we need to change the flagged code below, or bump the Python version requirement?

i.e. remove the following from pyproject.toml

"Programming Language :: Python :: 3.9",

This is the current error:

`mypy.....................................................................Failed

• hook id: mypy
• duration: 1.59s
• exit code: 1

osc_extraction_utils/settings.py:37: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:73: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:90: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:98: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:111: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:142: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:160: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:212: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:215: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/settings.py:216: error: X | Y syntax for unions requires Python 3.10 [syntax]
osc_extraction_utils/paths.py:143: error: X | Y syntax for unions requires Python 3.10 [syntax]
Found 11 errors in 2 files (checked 1 source file)
`