Remove support for Ruby 2.6 (mastodon#21477)

As pointed out by mastodon#21297 (comment) at least one of our dependencies already dropped support for Ruby 2.6, and we had removed Ruby 2.6 tests from the CI over a year ago (mastodon#16861). So stop advertising Ruby 2.6 support, bump targeted version, and drop some compatibility code.
hachyderm · Nov 27, 2022 · 098ced7 · 098ced7
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diff --git a/.rubocop.yml b/.rubocop.yml
@@ -2,7 +2,7 @@ require:
   - rubocop-rails
 
 AllCops:
-  TargetRubyVersion: 2.5
+  TargetRubyVersion: 2.7
   NewCops: disable
   Exclude:
     - 'spec/**/*'

diff --git a/Gemfile b/Gemfile
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 source 'https://rubygems.org'
-ruby '>= 2.6.0', '< 3.1.0'
+ruby '>= 2.7.0', '< 3.1.0'
 
 gem 'pkg-config', '~> 1.4'
 gem 'rexml', '~> 3.2'

diff --git a/README.md b/README.md
@@ -72,7 +72,7 @@ Mastodon acts as an OAuth2 provider, so 3rd party apps can use the REST and Stre
 
 - **PostgreSQL** 9.5+
 - **Redis** 4+
-- **Ruby** 2.6+
+- **Ruby** 2.7+
 - **Node.js** 14+
 
 The repository includes deployment configurations for **Docker and docker-compose** as well as specific platforms like **Heroku**, **Scalingo**, and **Nanobox**. The [**standalone** installation guide](https://docs.joinmastodon.org/admin/install/) is available in the documentation.

diff --git a/config/application.rb b/config/application.rb
@@ -22,7 +22,6 @@
 Bundler.require(*Rails.groups)
 
 require_relative '../lib/exceptions'
-require_relative '../lib/enumerable'
 require_relative '../lib/sanitize_ext/sanitize_config'
 require_relative '../lib/redis/namespace_extensions'
 require_relative '../lib/paperclip/url_generator_extensions'

diff --git a/lib/enumerable.rb b/lib/enumerable.rb