upgrade procrunner for newer Python versions

* ProcRunner version: *
* Python version: 3.5+
* Operating System: *

### Description

With Python <3.5 support dropped we should be able to use native functions to get most of the functionality in a more deterministic manner.
This may be of interest:
https://kevinmccarthy.org/2016/07/25/streaming-subprocess-stdin-and-stdout-with-asyncio-in-python/