Fix issue with bin/packs command having no output

[alexevanczuk]

This fixes an issue where we weren't forwarding terminal output to the main terminal, resulting in an unexpected lack of visible progress.

Before

~/workspace/zenpayroll - (main) $ bin/packs
Hello! What would you like to do? Run bin/packwerk update-deprecations
Running via Spring preloader in process 49546
~/workspace/zenpayroll - (main) $ 

After

~/workspace/zenpayroll - (main) $ bin/packs
Hello! What would you like to do? Run bin/packwerk update-deprecations
[TEST PROF INFO] Spring detected
Running via Spring preloader in process 49853
📦 Packwerk is inspecting X files
# lots of dots
📦 Finished in 8.58 seconds

No offenses detected
✅ `deprecated_references.yml` has been updated.