v3.5.21

Enhancements:

• Fix Gem::MissingSpecVersionError#to_s not showing exception message.
  Pull request #8074 by
  deivid-rodriguez
• Remove code that makes suggest_gems_from_name give worse results. Pull
  request #8083 by
  duckinator
• Warning about PATH in --user-install mode is only necessary for gems
  with executables. Pull request
  #8071 by
  deivid-rodriguez
• Installs bundler 2.5.21 as a default gem.

Bug fixes:

• Fix error in one source when fetching dependency APIs clearing results
  from all sources. Pull request
  #8080 by
  deivid-rodriguez
• Fix gem cleanup warning when two versions of psych installed. Pull
  request #8072 by
  deivid-rodriguez