loongson/pypi: links for ipykernel

loongson/pypi ipykernel-6.0.1.tar.gz
loongson/pypi ipykernel-6.0.1-py3-none-any.whl
loongson/pypi ipykernel-5.4.3.tar.gz
loongson/pypi ipykernel-5.4.3-py3-none-any.whl