Updates the version of Bundler used in .travis.yml
This fixes a deployment issue with Heroku. The suggested fix does not fix the problem; updating to Ruby 3.3.4 does.
Downloading net-pop-0.1.2 revealed dependencies not in the API or the lockfile
(net-protocol (>= 0)).
Running `bundle update net-pop` should fix the problem.
This PR:
3.3.3to3.3.4.travis.ymlThis fixes a deployment issue with Heroku. The suggested fix does not fix the problem; updating to Ruby 3.3.4 does.