Remove Ruby 2.7 support (#453)

Author: mensfeld

.github/workflows/ci.yml

@@ -26,7 +26,6 @@ jobs:
           - '3.2'
           - '3.1'
           - '3.0'
-          - '2.7'
         include:
           - ruby: '3.3'
             coverage: 'true'

CHANGELOG.md

@@ -1,6 +1,7 @@
 # Rdkafka Changelog
 
 ## 0.16.0 (Unreleased)
+- **[Breaking]** Retire support for Ruby 2.7.
 - **[Feature]** Support incremental config describe + alter API.
 - **[Feature]** Oauthbearer token refresh callback (bruce-szalwinski-he)
 - **[Feature]** Provide ability to use topic config on a producer for custom behaviors per dispatch.

rdkafka.gemspec

@@ -15,7 +15,7 @@ Gem::Specification.new do |gem|
   gem.name = 'rdkafka'
   gem.require_paths = ['lib']
   gem.version = Rdkafka::VERSION
-  gem.required_ruby_version = '>= 2.7'
+  gem.required_ruby_version = '>= 3.0'
   gem.extensions = %w(ext/Rakefile)
   gem.cert_chain = %w[certs/cert_chain.pem]