chore: bump dependencies and remove ruby eol versions

.github/workflows/ruby.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2', 'jruby-head']
+        ruby-version: ['3.1', '3.2', '3.3', 'jruby-head']
 
     steps:
     - uses: actions/checkout@v2

README.md

@@ -15,8 +15,8 @@ https://github.com/omniauth/omniauth-saml
 
 ## Requirements
 
-* [OmniAuth](http://www.omniauth.org/) 1.3+
-* Ruby 2.4.x+
+* [OmniAuth](http://www.omniauth.org/) 2.1+
+* Ruby 3.1.x+
 
 ## Versioning
 

omniauth-saml.gemspec

@@ -11,17 +11,17 @@ Gem::Specification.new do |gem|
   gem.email         = 'rajiv@alum.mit.edu'
   gem.homepage      = 'https://github.com/omniauth/omniauth-saml'
 
-  gem.required_ruby_version = '>= 2.4'
+  gem.required_ruby_version = '>= 3.1'
 
-  gem.add_runtime_dependency 'omniauth', '~> 2.0'
-  gem.add_runtime_dependency 'ruby-saml', '~> 1.12'
+  gem.add_runtime_dependency 'omniauth', '~> 2.1'
+  gem.add_runtime_dependency 'ruby-saml', '>= 1.17'
 
-  gem.add_development_dependency 'rake', '>= 12.3.3'
-  gem.add_development_dependency 'rspec', '~>3.4'
-  gem.add_development_dependency 'simplecov', '~> 0.11'
-  gem.add_development_dependency 'rack-test', '~> 0.6', '>= 0.6.3'
-  gem.add_development_dependency 'conventional-changelog', '~> 1.2'
-  gem.add_development_dependency 'coveralls', '>= 0.8.23'
+  gem.add_development_dependency 'rake', '~> 13.2'
+  gem.add_development_dependency 'rspec', '~> 3.13'
+  gem.add_development_dependency 'simplecov', '~> 0.10'
+  gem.add_development_dependency 'rack-test', '~> 2.1'
+  gem.add_development_dependency 'conventional-changelog', '~> 1.3'
+  gem.add_development_dependency 'coveralls', '~> 0.8'
 
   gem.files         = ['README.md', 'CHANGELOG.md', 'LICENSE.md'] + Dir['lib/**/*.rb']
   gem.test_files    = Dir['spec/**/*.rb']

spec/omniauth/strategies/saml_spec.rb

@@ -410,7 +410,7 @@ def test_default_relay_state(static_default_relay_state = nil, &block_default_re
 
     it 'should get SP metadata page' do
       expect(last_response.status).to eq 200
-      expect(last_response.header["Content-Type"]).to eq "application/xml"
+      expect(last_response.headers["Content-Type"]).to eq "application/xml"
     end
 
     it 'should configure attributes consuming service' do