Use correct sqlite version for Rails < 7.2

Rails 7.2 onwards has support for sqlite 2 and this also
allows sqlite >= 2.0 for Rails 8.0 tests.

Author: tvdeyen

Gemfile

@@ -21,7 +21,7 @@ group :test do
   gem 'mysql2'
   gem 'pg'
   gem 'solidus_auth_devise'
-  gem 'sqlite3', '~> 1.4'
+  gem 'sqlite3', rails_version < '~> 7.2' ? '~> 1.4' : '~> 2.0'
 end
 
 # Use a local Gemfile to include development dependencies that might not be

lib/solidus_dev_support/templates/extension/Gemfile.tt

@@ -15,18 +15,16 @@ else
   gem 'solidus_frontend', github: 'solidusio/solidus', branch: branch
 end
 
-# Needed to help Bundler figure out how to resolve dependencies,
-# otherwise it takes forever to resolve them.
-# See https://github.com/bundler/bundler/issues/6677
-gem 'rails', '>0.a'
+rails_version = ENV.fetch('RAILS_VERSION', '~> 7.0')
+gem 'rails', rails_version
 
 case ENV.fetch('DB', nil)
 when 'mysql'
   gem 'mysql2'
 when 'postgresql'
   gem 'pg'
 else
-  gem 'sqlite3', '~> 1.4'
+  gem 'sqlite3', rails_version < '~> 7.2' ? '~> 1.4' : '~> 2.0'
 end
 
 if rails_version == '~> 7.0'