message: Update Gemfile
  mimemagic fails to install. This change fixes it.
  More info:
diff: @@ -3,6 +3,9 @@ git_source(:github) { |repo| "https://github.com/#{repo}.git" }
  ruby '2.5.1'
  +# https://stackoverflow.com/questions/66919504/your-bundle-is-locked-to-mimemagic-0-3-5-but-that-version-could-not-be-found
  +gem 'mimemagic', github: 'mimemagicrb/mimemagic', ref: '01f92d86d15d85cfd0f20dabd025dcbd36a8a60f'
  +
  # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
  gem 'rails', '~> 5.2.1'
  # Use postgresql as the database for Active Record
  