Modernize code + drop support for Ruby v3.1.

Author: ioquatix

.github/workflows/test-external.yaml

@@ -20,7 +20,6 @@ jobs:
           - macos
 
         ruby:
-          - "3.1"
           - "3.2"
           - "3.3"
           - "3.4"

.github/workflows/test.yaml

@@ -10,11 +10,9 @@ env:
 
 jobs:
   test:
-    name: ${{matrix.ruby}} on ${{matrix.os}} ${{matrix.gemfile}}
+    name: ${{matrix.ruby}} on ${{matrix.os}}
     runs-on: ${{matrix.os}}-latest
     continue-on-error: ${{matrix.experimental}}
-    env:
-      BUNDLE_GEMFILE: ${{matrix.gemfile}}
 
     strategy:
       matrix:
@@ -23,17 +21,10 @@ jobs:
           - macos
 
         ruby:
-          - "3.1"
           - "3.2"
           - "3.3"
           - "3.4"
 
-        gemfile:
-          - gems/rack-v1.rb
-          - gems/rack-v2.rb
-          - gems/rack-v30.rb
-          - gems/rack-v31.rb
-        
         experimental: [false]
 
         include:

.rubocop.yml

@@ -45,6 +45,9 @@ Layout/EmptyLinesAroundClassBody:
 Layout/EmptyLinesAroundModuleBody:
   Enabled: true
 
+Layout/EmptyLineAfterMagicComment:
+   Enabled: true
+
 Style/FrozenStringLiteralComment:
   Enabled: true
 

bake.rb

@@ -9,4 +9,4 @@
 def after_gem_release_version_increment(version)
 	context["releases:update"].call(version)
 	context["utopia:project:readme:update"].call
-end
+end

gems.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Released under the MIT License.
-# Copyright, 2022-2024, by Samuel Williams.
+# Copyright, 2022-2025, by Samuel Williams.
 
 source "https://rubygems.org"
 

lib/protocol/rack/version.rb

@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 # Released under the MIT License.
-# Copyright, 2022-2024, by Samuel Williams.
+# Copyright, 2022-2025, by Samuel Williams.
 
 module Protocol
 	module Rack

protocol-rack.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
 
 	spec.files = Dir.glob(["{lib}/**/*", "*.md"], File::FNM_DOTMATCH, base: __dir__)
 
-	spec.required_ruby_version = ">= 3.1"
+	spec.required_ruby_version = ">= 3.2"
 
 	spec.add_dependency "protocol-http", "~> 0.43"
 	spec.add_dependency "rack", ">= 1.0"