Fix loading issues with modern rails versions

.github/workflows/build.yml

@@ -12,7 +12,7 @@ jobs:
     name: Ruby ${{ matrix.version }}
     strategy:
       matrix:
-        version: ['3.1', '3.2', '3.3']
+        version: ['3.2', '3.3', '3.4']
 
     steps:
       - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0

CHANGELOG.md

@@ -1,5 +1,11 @@
 Unreleased
 ----------
+- ⚠️ [Breaking] Bumps minimum supported Rails version to 7.1 & Ruby version to 3.2; moves jobs from `lib` to `app` to fix loading issues with modern rails versions. [#2020](https://github.com/Shopify/shopify_app/pull/2020)
+  - ActiveJob classes moved from `lib/shopify_app/jobs/` to `app/jobs/shopify_app/` to follow Rails conventions and fix timing issues with ActiveJob initialization
+  - Jobs are now autoloaded by Rails instead of explicitly required during gem initialization
+  - **For most apps**: No changes needed. Jobs are internal to the gem and will be autoloaded correctly
+  - **If your app has custom ActiveJob serializers**: See [Upgrading guide](/docs/Upgrading.md#v2300-minimum-ruby-32-and-rails-71-required-jobs-moved-to-appjobs) for migration steps
+  - Additional dependency updates: sqlite3 (1.x → 2.x), added `csv` and `mutex_m` development dependencies for Ruby 3.4+ compatibility
 - ⚠️ [Breaking] Removes `ShopifyApp::JWTMiddleware` and `ShopifyApp::JWT` See [Upgrading](/docs/Upgrading.md) for more migration. [1960](https://github.com/Shopify/shopify_app/pull/1960)
 - ⚠️ [Breaking] Removed deprecated `CallbackController` methods. `perform_after_authenticate_job`, `install_webhooks`, and `perform_post_authenticate_jobs` have been removed. [#1961](https://github.com/Shopify/shopify_app/pull/1961)
 - ⚠️ [Breaking] Bumps minimum supported Ruby version to 3.1 [#1959](https://github.com/Shopify/shopify_app/pull/1959)

Gemfile

@@ -6,7 +6,7 @@ source "https://rubygems.org"
 gemspec
 
 gem "rails-controller-testing", group: :test
-gem "rails", "< 7" # temporary: https://github.com/Shopify/shopify_app/pull/1561
+gem "rails", "~> 7.1.0"
 
 group :rubocop do
   gem "rubocop-shopify", require: false