Raise minimum required resources (RAM) per CPU core

[tdruez]

After some investigation on the "A process in the process pool was terminated abruptly while the future was running or pending." type of error while running the scan_codebase pipeline, I've noticed that each process needs around 2GB of RAM at the moment instead of the 1GB recommended in the docs.

This is mainly caused by the licensedcode.cache.get_cache call that loads an index in the memory of each process. Ideally, this index should be shared. See nexB/scancode-toolkit#3755