Marker fixes

[dimbleby]

First fix is I think cosmetic in unhittable code, the second finds a new marker simplification at intersection - code is analogous to the similar case in unions

poetry-core/src/poetry/core/version/markers.py

Lines 640 to 647 in 97ab42c

	elif (
	isinstance(constraint_union, VersionConstraint)
	and constraint_union.is_simple()
	):
	new_markers[i] = SingleMarker(
	mark.name, constraint_union
	)
	included = True

without the fix the intersection looks like ... and python_version <= "3.6" and python_version >= "3.6"

[sonarcloud]

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