Upgrades OSSubprocess for Pharo 9

[sebastianconcept]

OSSubprocess:v1.3.0 is needed for loading it in Pharo 9

[capsulecorplab]

Sorry for the late response~ @sebastianconcept Is there a proper way to load your branch in Metacello?

[sebastianconcept]

@capsulecorplab sorry for that. I've forgot that Iceberg doesn't know how to parse bugifx/. I've just pushed the same commit without that prefix.

Please use this:

Metacello new
	baseline: 'PythonBridge';
	repository: 'github://sebastianconcept/PythonBridge:load-issue-in-P9-with-OSSubprocess';
	load.