New review comment by paper42 on void-packages repository

https://github.com/void-linux/void-packages/pull/34122#discussion_r751650610

Comment:
Why is this only in checkdepends when it's imported in __init__.py? Anyway, since you are patching importlib_metadata, we shouldn't need to this dependency. I think we should import this patch instead of running sed in post_patch: https://github.com/matrix-org/python-signedjson/commit/c40c83f844fee3c1c7b0c5d1508f87052334b4e5