Remove support for Ruby 2.6 (karafka#305)

Author: mensfeld

.github/workflows/ci.yml

@@ -28,7 +28,6 @@ jobs:
           - '3.0.0'
           - '2.7'
           - '2.7.0'
-          - '2.6.8'
         include:
           - ruby: '3.2'
             coverage: 'true'

CHANGELOG.md

@@ -1,3 +1,6 @@
+# 0.14.0 (Unreleased)
+* [Change] Remove support for Ruby 2.6 due to it being EOL and WeakMap incompatibilities.
+
 # 0.13.0
 * Support cooperative sticky partition assignment in the rebalance callback (methodmissing)
 * Support both string and symbol header keys (ColinDKelley)

rdkafka.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |gem|
   gem.name = 'rdkafka'
   gem.require_paths = ['lib']
   gem.version = Rdkafka::VERSION
-  gem.required_ruby_version = '>= 2.6'
+  gem.required_ruby_version = '>= 2.7'
   gem.extensions = %w(ext/Rakefile)
 
   gem.add_dependency 'ffi', '~> 1.15'