loongson/pypi: links for typing-extensions

INFO: Because this project isn't in the mirror_whitelist, no releases from root/pypi are included.

loongson/pypi typing_extensions-4.3.0-py3-none-any.whl
loongson/pypi typing_extensions-3.10.0.2-py3-none-any.whl
loongson/pypi typing_extensions-3.7.4.3-py3-none-any.whl