DeprecationWarning raised in CI

[ElliottKasoar]

Currently (re-)running the CI throws an error, due to a deprecation warning when loading CHGNet (see also: materialsproject/pymatgen#4243):

==================================== ERRORS ====================================
_______________ ERROR collecting tests/test_mlip_calculators.py ________________
tests/test_mlip_calculators.py:8: in <module>
    from chgnet.model.model import CHGNet
.venv/lib/python3.10/site-packages/chgnet/model/__init__.py:3: in <module>
    from chgnet.model.dynamics import CHGNetCalculator, MolecularDynamics, StructOptimizer
.venv/lib/python3.10/site-packages/chgnet/model/dynamics.py:24: in <module>
    from pymatgen.analysis.eos import BirchMurnaghan
.venv/lib/python3.10/site-packages/pymatgen/analysis/eos.py:23: in <module>
    from pymatgen.core.units import FloatWithUnit
.venv/lib/python3.10/site-packages/pymatgen/core/__init__.py:12: in <module>
    from pymatgen.core.composition import Composition
.venv/lib/python3.10/site-packages/pymatgen/core/composition.py:22: in <module>
    from pymatgen.core.periodic_table import DummySpecies, Element, ElementType, Species, get_el_sp
.venv/lib/python3.10/site-packages/pymatgen/core/periodic_table.py:63: in <module>
    class ElementBase(Enum):
.venv/lib/python3.10/site-packages/pymatgen/core/periodic_table.py:755: in ElementBase
    @deprecated(is_rare_earth, message="is_rare_earth is corrected to include Y and Sc.", deadline=(2025, 1, 1))
.venv/lib/python3.10/site-packages/monty/dev.py:157: in deprecated
    raise_deadline_warning()
.venv/lib/python3.10/site-packages/monty/dev.py:86: in raise_deadline_warning
    raise DeprecationWarning(
E   DeprecationWarning: This function should have been removed on 2025-01-01.

---------- coverage: platform linux, python 3.10.16-final-0 ----------
Coverage XML written to file coverage.xml

=========================== short test summary info ============================
ERROR tests/test_mlip_calculators.py - DeprecationWarning: This function should have been removed on 2025-01-01.
!!!!!!!!!!!!!!!!!!!! Interrupted: 1 error during collection !!!!!!!!!!!!!!!!!!!!
=============================== 1 error in 4.56s ===============================

Since the warning is generated by raise, it seems that --disable-warnings and other pytest filters don't suppress this, so I'm not sure if there's a simple workaround?

One option could be to alter he environment variables that are checked before the warning is raised e.g. GITHUB_REPOSITORY/CI - see CI/repository checks, but that may have unexpected side effects, so I don't think it's a good solution.

Hopefully this can be removed from pymatgen relatively quickly, but unfortunately they only support Python 3.10+, so we may need to reconsider 3.9 support to make use of any fixes.