Remove is_rare_earth_metal from ElementBase (periodic_table.py) (#4242)

* Remove is_rare_earth_metal from periodic_table.py

* Rm deprecated from monty

* Rm is_rare_earth_metal from docs/pymatgen.md

Author: jdewasseigeosium

docs/pymatgen.md

@@ -14,7 +14,6 @@
 from typing import TYPE_CHECKING, overload
 
 import numpy as np
-from monty.dev import deprecated
 from monty.json import MSONable
 
 from pymatgen.core.units import SUPPORTED_UNIT_NAMES, FloatWithUnit, Ha_to_eV, Length, Mass, Unit
@@ -754,19 +753,6 @@ def is_rare_earth(self) -> bool:
         """
         return self.is_lanthanoid or self.is_actinoid or self.symbol in {"Sc", "Y"}
 
-    @property
-    @deprecated(
-        is_rare_earth,
-        message="is_rare_earth is corrected to include Y and Sc.",
-        deadline=(2025, 1, 1),
-    )
-    def is_rare_earth_metal(self) -> bool:
-        """True if element is a rare earth metal, Lanthanides (La) series and Actinides (Ac) series.
-
-        This property is Deprecated, and scheduled for removal after 2025-01-01.
-        """
-        return self.is_lanthanoid or self.is_actinoid
-
     @property
     def is_metal(self) -> bool:
         """True if is a metal."""