feat: update minimum ruby version to 2.7.0

Author: Mattia Roccoberton

.github/workflows/specs_mysql_60.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.6', '2.7', '3.0']
+        ruby: ['2.7', '3.0']
         gemfile: ['rails_6_0_mysql']
 
     env:

.github/workflows/specs_mysql_61.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.6', '2.7', '3.0']
+        ruby: ['2.7', '3.0']
         gemfile: ['rails_6_1_mysql']
 
     env:

.github/workflows/specs_postgres_60.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.6', '2.7', '3.0']
+        ruby: ['2.7', '3.0']
         gemfile: ['rails_6_0_postgres']
 
     env:

.github/workflows/specs_postgres_61.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        ruby: ['2.6', '2.7', '3.0']
+        ruby: ['2.7', '3.0']
         gemfile: ['rails_6_1_postgres']
 
     env:

.rubocop.yml

@@ -12,7 +12,7 @@ AllCops:
     - gemfiles/*
     - spec/dummy??/**/*
     - vendor/**/*
-  TargetRubyVersion: 2.6
+  TargetRubyVersion: 2.7
 
 Lint/MissingSuper:
   Exclude:

active_storage_db.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |spec|
   spec.description = 'An ActiveStorage service plugin to store files in database.'
   spec.license     = 'MIT'
 
-  spec.required_ruby_version = '>= 2.6.0'
+  spec.required_ruby_version = '>= 2.7.0'
 
   spec.metadata['homepage_uri'] = spec.homepage
   spec.metadata['source_code_uri'] = spec.homepage