Dependency on dead project `retry`

[apmorton]

retry is not being maintained, and exports a false dependency on py, which is also not being maintained.

This is causing some pretty convoluted issues in our environment.

The core logic for retry is pretty simple and could be inlined into this project to resolve this - or swapped for another similar library that is being maintained: https://pypi.org/project/tenacity/

See:

• https://github.com/invl/retry/issues
• https://github.com/pytest-dev/py

[joserc87]

@apmorton The latest version v1.1.5 doesn't depend on retry nor py but on tenacity. I hope that solves the issues you were having in your environment 🍀