Deprecate old Cubic EoS #7121

Job	Run time
Check Spelling	10s
Compatibility tests	4m 37s
Check code formatting (Black)	33s
Build Sphinx docs	5m 33s
pytest (py3.9/linux)	20m 42s
Pylint	4m 12s
pytest (py3.9/win64)	29m 14s
pytest (py3.10/linux)	13m 59s
pytest (py3.10/win64)	32m 51s
pytest (py3.11/linux)	19m 32s
pytest (py3.11/win64)	35m 56s
pytest (py3.12/linux)	12m 22s
pytest (py3.12/win64)	29m 4s
Upload coverage report (Codecov)	1s
	3h 28m 46s

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