Import directly (no need for conditional) when python_requires = >= 3.8

[todo]

pyomop/src/pyomop/__init__.py

Lines 54 to 59 in b358b5e

	# TODO: Import directly (no need for conditional) when `python_requires = >= 3.8`
	from importlib.metadata import PackageNotFoundError, version # pragma: no cover
	else:
	from importlib_metadata import PackageNotFoundError, version # pragma: no cover
	try:

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This issue was generated by todo based on a TODO comment in b358b5e when #10 was merged. cc @dermatologist.