Add Ruby 3.3 to build matrix (#533)

Also update lingering references to Ruby 2.7 in rubocop & gemspec config
as it has been EOL for a while now.

.github/workflows/tests.yml

@@ -24,7 +24,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2"]
+        ruby-version: ["3.0", "3.1", "3.2", "3.3"]
         rails-version:
           - "6.1.7.6"
           - "7.0.8"
@@ -34,6 +34,8 @@ jobs:
         exclude:
           - ruby-version: "3.2"
             rails-version: "6.1.7.6"
+          - ruby-version: "3.3"
+            rails-version: "6.1.7.6"
     runs-on: ubuntu-latest
     services:
       postgres:
@@ -67,15 +69,17 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2"]
+        ruby-version: ["3.0", "3.1", "3.2", "3.3"]
         rails-version:
           - "6.1.7.6"
           - "7.0.8"
           - "7.1.1"
           - "main"
         mysql-version: ["8.0", "8.2"]
         exclude:
-          - ruby-version: 3.2
+          - ruby-version: "3.2"
+            rails-version: "6.1.7.6"
+          - ruby-version: "3.3"
             rails-version: "6.1.7.6"
     runs-on: ubuntu-latest
     services:

.rubocop.yml

@@ -4,7 +4,7 @@ inherit_gem:
   gc_ruboconfig: rubocop.yml
 
 AllCops:
-  TargetRubyVersion: 2.7
+  TargetRubyVersion: 3.0
   NewCops: enable
 
 Metrics/AbcSize:

.ruby-version

@@ -1 +1 @@
-3.2.2
+3.3.0

statesman.gemspec

@@ -20,7 +20,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.required_ruby_version = ">= 2.7"
+  spec.required_ruby_version = ">= 3.0"
 
   spec.add_development_dependency "ammeter", "~> 1.1"
   spec.add_development_dependency "bundler", "~> 2"