Update to listen 3.2

[eregon]

Summary

This is a backport of #37788 to 6.0-stable.

listen 3.2, among other fixes, removes the unmaintained ruby_dep dependency, which incorrectly shows warnings when running on TruffleRuby:

$ bundle exec rails s
RubyDep: WARNING: Your Ruby may not be supported.
RubyDep: WARNING: Your Ruby is: 2.6.2 'truffleruby' (unrecognized). If you need this version supported, please open an issue at http://github.com/e2/ruby_dep
RubyDep: WARNING: (To disable warnings, see:http://github.com/e2/ruby_dep/wiki/Disabling-warnings )
=> Booting Puma
=> Rails 6.0.1 application starting in development 
=> Run `rails server --help` for more startup options
Puma starting in single mode...
* Version 4.3.0 (truffleruby 19.3.0 - ruby 2.6.2), codename: Mysterious Traveller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://127.0.0.1:3000
* Listening on tcp://[::1]:3000
Use Ctrl-C to stop

I am not aware of any issue by using a newer version of listen.

https://github.com/guard/listen/releases/tag/v3.2.0 are the release notes and guard/listen#465 is the issue asking for this new release.

ddddedc is the commit that added the < 3.2 version constraint. I guess that was just precaution (3.2 did not exist back then).