Update dead url
The new one is found here https://github.com/domdfcoding/dom_toml/blob/9b644b96c747647d9f2a19b6397827d86b0dc2f8/pyproject.toml#L43
Due to an influx of spam, we have had to temporarily disable account registrations. Please write an email to accountsupport@archlinux.org, with your desired username, if you want to get access. Sorry for the inconvenience.
The new one is found here https://github.com/domdfcoding/dom_toml/blob/9b644b96c747647d9f2a19b6397827d86b0dc2f8/pyproject.toml#L43