Drop support for EOL versions of Ruby and Rails

.github/workflows/test_suite.yml

@@ -1,32 +1,16 @@
 name: Test Suite
 
-on:
-  push:
-    branches: [main]
-  pull_request:
-    branches: [main]
+on: [push]
+
 jobs:
   run-tests:
     runs-on: ubuntu-latest
     strategy:
       fail-fast: false
       matrix:
         orm: [active_record, mongoid]
-        rails: ["5.2", "6.0", "6.1", "7.0"]
-        ruby: ["2.7", "3.0", "3.1", "3.2", "3.3", head]
-        exclude:
-          - rails: 5.2
-            ruby: 3.0
-          - rails: 5.2
-            ruby: 3.1
-          - rails: 5.2
-            ruby: 3.2
-          - rails: 5.2
-            ruby: 3.3
-          - rails: 5.2
-            ruby: head
-          - rails: 7.0
-            ruby: 2.6
+        rails: ["7.0"]
+        ruby: ["3.1", "3.2", "3.3", head]
     steps:
       - uses: actions/checkout@v3
       - uses: ruby/setup-ruby@v1

Appraisals

@@ -1,26 +1,6 @@
 # frozen_string_literal: true
 
-appraise 'rails-5.2' do
-  gem 'railties', '~> 5.2.0'
-  gem 'minitest-rails', '~> 5.2.0'
-end
-
-appraise 'rails-6.0' do
-  gem 'railties', '~> 6.0.0'
-  gem 'minitest-rails', '~> 6.0.0'
-end
-
-appraise 'rails-6.1' do
-  gem 'railties', '~> 6.1.0'
-  gem 'minitest-rails', '~> 6.1.0'
-end
-
 appraise 'rails-7.0' do
   gem 'railties', '~> 7.0.1' # Rails 7.0.0 and Ruby 3.1 are incompatible. See https://github.com/rails/rails/issues/43998 and https://github.com/rails/rails/pull/43951
   gem 'minitest-rails', '~> 7.0.0'
 end
-
-appraise 'rails-7.0' do
-  gem 'railties', '~> 7.0.0'
-  gem 'minitest-rails', '~> 7.0.0'
-end