Please release a new version

[eike-fokken]

Hi!
This looks like a great library!
If I understand correctly, the newest version on pypi:

https://pypi.org/project/sortedcontainers/

seems to be three years old. It tells me, it was released on May, 17th, 2021 and newest supported python version is 3.7. According to the commit history, much has changed since then.

Could you publish a current one?