Replace dict interface of `SpglibDataset`

Description

Replace dict interface of SpglibDataset

Comments

Getting:

 ../../../micromamba/envs/pmg/lib/python3.11/site-packages/spglib/spglib.py:115
  /Users/runner/micromamba/envs/pmg/lib/python3.11/site-packages/spglib/spglib.py:115: DeprecationWarning: dict interface (SpglibDataset['number']) is deprecated.Use attribute interface ({self.__class__.__name__}.{key}) instead
    warnings.warn(

../../../micromamba/envs/pmg/lib/python3.11/site-packages/spglib/spglib.py:115
  /Users/runner/micromamba/envs/pmg/lib/python3.11/site-packages/spglib/spglib.py:115: DeprecationWarning: dict interface (SpglibDataset['international']) is deprecated.Use attribute interface ({self.__class__.__name__}.{key}) instead
    warnings.warn(

Summary of changes

Replace dict interface of SpglibDataset

Additional information

No