Modernize a few dependencies

[amotl]

A few libraries caught our attention.

• Use a better urlparse?
  • https://github.com/python-hyper/rfc3986
  • https://github.com/python-hyper/hyperlink
  • https://github.com/tkem/uritools
  • https://github.com/aio-libs/yarl
• The successor to appdirs is platformdirs.