Release 3.2.0

[dentarg]

Looks like a new minor version could be released with the following changes

• feature: add except to IndifferntHash #1940
• Use relative URL for the 404 image #1943
• Add base64 to rack-protection runtime dependencies #1946
• Remove open-ended dependencies in gemspecs f044fe9
  • from Use Gemfiles to manage dev/test dependencies + cleanup #1949
• Use Exception#detailed_message to show backtrace #1952
• Add Sinatra::HamlHelpers to sinatra-contrib #1960
• Ruby 3.3 + Bundler 2.5 compatibility #1975
  • Issue: Classic Style Application without a config.ru does not work with Ruby 3.3 and Bundler 2.5 #1973

Commits: v3.1.0...3b75657