Tests

Add new Complementarity formualtion for VLE with cubic EoSs #6369

Job	Run time
Compatibility tests	4m 29s
Check code formatting (Black)	34s
Check Spelling	7s
Pylint	4m 36s
Build Sphinx docs	5m 27s
pytest (py3.8/linux)	20m 1s
pytest (py3.8/win64)	37m 18s
pytest (py3.9/linux)	19m 37s
pytest (py3.9/win64)	34m 30s
pytest (py3.10/linux)	16m 57s
pytest (py3.10/win64)	36m 16s
pytest (py3.11/linux)	26m 3s
pytest (py3.11/win64)	46m 57s
pytest (py3.12/linux)	15m 42s
pytest (py3.12/win64)	28m 56s
Upload coverage report (Codecov)	0s
	4h 57m 30s

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