Fix sqlite3 compatibility in test matrix

- Use Ruby 3.3 instead of 3.0 (3.0 is EOL, 3.3 supports sqlite3 2.x)
- Pin sqlite3 ~> 1.4 for Rails 6.x (required by activerecord 6.1)

Author: tf

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         ruby-version:
-          - '3.0'
+          - '3.3'
         gemfile:
           - gemfiles/rails_6.x_active_admin_2.x.gemfile
           - gemfiles/rails_6.x_active_admin_3.x.gemfile

Appraisals

@@ -16,11 +16,13 @@ end
 appraise 'rails-6.x-active-admin-2.x' do
   gem 'rails', '~> 6.1'
   gem 'activeadmin', '~> 2.0'
+  gem 'sqlite3', '~> 1.4'
 end
 
 appraise 'rails-6.x-active-admin-3.x' do
   gem 'rails', '~> 6.1'
   gem 'activeadmin', '~> 3.0'
+  gem 'sqlite3', '~> 1.4'
 end
 
 appraise 'rails-7.x-active-admin-3.x' do

gemfiles/rails_6.x_active_admin_2.x.gemfile

@@ -5,5 +5,6 @@ source "https://rubygems.org"
 gem "sass-rails"
 gem "rails", "~> 6.1"
 gem "activeadmin", "~> 2.0"
+gem "sqlite3", "~> 1.4"
 
 gemspec path: "../"

gemfiles/rails_6.x_active_admin_3.x.gemfile

@@ -5,5 +5,6 @@ source "https://rubygems.org"
 gem "sass-rails"
 gem "rails", "~> 6.1"
 gem "activeadmin", "~> 3.0"
+gem "sqlite3", "~> 1.4"
 
 gemspec path: "../"