Bump the range of supported Ruby and Rails versions

Ruby 3.2 is out and 2.6 has reached the EOL:
https://www.ruby-lang.org/en/downloads/branches/

Also since Rails 5 has been dropped support for and
corresponding gemfiles are now dispensable to ci.

.github/workflows/ci.yml

@@ -21,23 +21,16 @@ jobs:
       matrix:
         os: [ ubuntu-latest ]
         ruby:
-          - 2.6
           - 2.7
           - '3.0'
           - '3.1'
+          - '3.2'
           - head
         gemfile:
-          - gemfiles/rails_5.0.gemfile
-          - gemfiles/rails_5.2.gemfile
           - gemfiles/rails_6.0.gemfile
           - gemfiles/rails_6.1.gemfile
           - gemfiles/rails_7.0.gemfile
           - gemfiles/doorkeeper_master.gemfile
-        exclude:
-          - ruby: 3.0
-            gemfile: gemfiles/rails_5_2.gemfile
-          - ruby: 2.6
-            gemfile: gemfiles/rails_7_0.gemfile
     steps:
       - name: Repo checkout
         uses: actions/checkout@v3

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - [#PR ID] Add your changelog entry here.
 - [#186] Simplify gem configuration reusing Doorkeeper configuration option DSL (thanks to @nbulaj).
+- [#182] Drop support for Ruby 2.6 and Rails 5.
 
 ## v1.8.4 (2023-02-01)
 

doorkeeper-openid_connect.gemspec

@@ -22,7 +22,7 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
-  spec.required_ruby_version = '>= 2.6'
+  spec.required_ruby_version = '>= 2.7'
 
   spec.add_runtime_dependency 'doorkeeper', '>= 5.5', '< 5.7'
   spec.add_runtime_dependency 'jwt', '>= 2.5'