Update to Ruby 3.3.4 (#338)

**This PR:**
- Updates Ruby from `3.3.3` to `3.3.4`
- 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](https://stackoverflow.com/a/78727621) 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.
```

.circleci/config.yml

@@ -3,7 +3,7 @@ version: 2.1
 jobs:
   build:
     docker:
-      - image: cimg/ruby:3.3.3-browsers
+      - image: cimg/ruby:3.3.4-browsers
         environment:
           BUNDLE_JOBS: 3
           BUNDLE_RETRY: 3

.tool-versions

@@ -1,2 +1,2 @@
-ruby 3.3.3
+ruby 3.3.4
 nodejs 22.6.0

.travis.yml

@@ -3,5 +3,5 @@ sudo: false
 language: ruby
 cache: bundler
 rvm:
-  - 3.3.3
-before_install: gem install bundler -v 2.0.2
+  - 3.3.4
+before_install: gem install bundler -v 2.3.27

Gemfile

@@ -3,7 +3,7 @@ source "https://rubygems.org"
 # Specify your gem"s dependencies in yuri-ita.gemspec
 gemspec
 
-ruby "3.3.3"
+ruby "3.3.4"
 
 gem "rails"
 

Gemfile.lock

@@ -168,6 +168,7 @@ GEM
       date
       net-protocol
     net-pop (0.1.2)
+      net-protocol
     net-protocol (0.2.2)
       timeout
     net-smtp (0.5.0)
@@ -354,7 +355,7 @@ DEPENDENCIES
   yuri-ita!
 
 RUBY VERSION
-   ruby 3.3.3p89
+   ruby 3.3.4p94
 
 BUNDLED WITH
    2.3.27

spec/example_app/.ruby-version

@@ -1 +1 @@
-ruby-3.3.3
+ruby-3.3.4