Update reminder + GitHub Actions

[jantman]

Next time I do much work on this, I want to update all dependencies plus the Docker image and everything inside it, as well as the tox test environments.

I also want to set up GitHub Actions for test, GitHub Release, and push to Docker Hub. I'll need something that parses the release notes and the version file.

[jantman]

GHA for build & release is done as of now (2.0.0), but I didn't update anything.