Update tests/chainerx_tests/op_utils.py
Update tests/chainerx_tests/op_utils.py

Co-Authored-By: niboshi <6ec538ad88d80aac1780d78552d1be961fd6834b@gmail.com>
niboshi/chainer,pfnet/chainer,okuta/chainer,hvy/chainer,wkentaro/chainer,keisuke-umezawa/chainer,niboshi/chainer,chainer/chainer,chainer/chainer,hvy/chainer,hvy/chainer,keisuke-umezawa/chainer,wkentaro/chainer,wkentaro/chainer,okuta/chainer,chainer/chainer,niboshi/chainer,hvy/chainer,wkentaro/chainer,keisuke-umezawa/chainer,niboshi/chainer,okuta/chainer,keisuke-umezawa/chainer,okuta/chainer,tkerola/chainer,chainer/chainer