Merge branch 'release-1.10.8'

anharmonic/file_IO.py

anharmonic/phonon3/conductivity_RTA.py

c/_spglib.c

c/spglib/arithmetic.c

c/spglib/cell.c

c/spglib/delaunay.c

c/spglib/kpoint.c

c/spglib/mathfunc.c

c/spglib/niggli.c

c/spglib/pointgroup.c

c/spglib/primitive.c

c/spglib/refinement.c

c/spglib/site_symmetry.c

c/spglib/spacegroup.c

c/spglib/spg_database.c

c/spglib/spglib.c

c/spglib/spin.c

c/spglib/symmetry.c

c/spglib_h/arithmetic.h

c/spglib_h/delaunay.h