fix duplicate lib dirs + update actions environment

[FoamyGuy]

resolves: #15

If the lib directory exists in project_files it will be removed from there, and it's contents will be added to libs so that they get sorted and rendered into the final screenshot in the remaining lib directory along with all of the dependencies that were found from the bundle

get_dependencies() now handles gracefully libraries that aren't in the bundle and thus we don't know about their dependencies. They are added to the list as-is without any dependency information.

I'm pretty sure this PR will be failing actions. It needs some of the infrastructure updates from #21 in order to successfully pass I think. But I omitted them from this PR in order to keep it more contained to a single change and to not duplicate changes across multiple PRs. After #21 is merged I'll come back and re-run the actions and fix anything still causing it to fail.

[FoamyGuy]

I ended up following a red herring for a little while looking for the reason the actions were failing. In the process I noticed that the version of python in use by the build-images action was python 3.8 due to it using ubuntu 20.04. I updated that to ubuntu 24.04 which brings it up to python 3.12, and made it use a venv in order to be compatible. This turned out not to be related to actual problem, but I've left it in because python 3.8 is EOL soon so I think it's good to go ahead and make this update anyway.

Everything else mentioned in the original comment is still accurate.

[jepler]

didn't test but it sounds like it's resolving a real problem.