[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

tests/database/test_db_vasp.py

@@ -10,7 +10,7 @@
 __package__ = "database"
 from dpdata import LabeledSystem
 from monty.serialization import loadfn
-from pymatgen.io.vasp import Incar, Kpoints, Poscar, Potcar
+from pymatgen.io.vasp import Kpoints, Poscar, Potcar
 
 from .context import (
     DPPotcar,