downgrade mypy==0.982 in style check (#6489)
downgrade mypy==0.982 in style check (#6489)

* update version

* test 0.982
yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL