[CI] Unit test for command_line.vampire is failing

[DanielYang59]

Singled out from #3985 for visibility, the only unit test for command_line.vampire seems to be failing now:

pymatgen/tests/command_line/test_vampire_caller.py

Lines 35 to 47 in 3fee7d5

	def test_vampire(self):
	for structs, energies in zip(self.structure_inputs, self.energy_inputs):
	settings = {"start_t": 0, "end_t": 500, "temp_increment": 50}
	vc = VampireCaller(
	structs,
	energies,
	mc_box_size=3.0,
	equil_timesteps=1000, # 1000
	mc_timesteps=2000, # 2000
	user_input_settings=settings,
	)
	assert approx(vc.output.critical_temp) == 400

Where vc.output.critical_temp is now 500 instead of expected 400.

Help needed as I have zero knowledge about vampire.