heroku/v439

Deploy fc5eed0

Diff: heroku/v436...heroku/v439

• Set DisableIMDSv1=false.
• SoundCloud: Link to larger artwork.
• Update README.md.
• Update gems.
• Ruby 3.0.1
• Ruby 3.0.2 and update gems.
• DisableIMDSv1 should be true.
• Add gp3 tip.
• Update Dockerfile comments.