Increment ruby version

Standard requires ruby 3.0

.github/workflows/test.yml

@@ -15,10 +15,10 @@ jobs:
       fail-fast: true
       matrix:
         ruby:
-          - 2.6
-          - 2.7
           - 3.0
           - 3.1
+          - 3.2
+          - 3.3
         experimental: [false]
         include:
           - ruby: head
@@ -35,7 +35,7 @@ jobs:
           bundler: 2
 
       - name: bundle install
-        run:  bundle install --jobs 4 --retry 3
+        run: bundle install --jobs 4 --retry 3
 
       - name: test
         timeout-minutes: 10

mail-ses.gemspec

@@ -13,7 +13,7 @@ Gem::Specification.new do |s|
   s.email = "[email protected]"
   s.files = Dir.glob("lib/**/*") + %w[CHANGELOG.md LICENSE README.md]
   s.homepage = "https://github.com/tablecheck/mail-ses"
-  s.required_ruby_version = ">= 2.6.0"
+  s.required_ruby_version = ">= 3.0.0"
 
   s.add_dependency("aws-sdk-sesv2", ">= 1.27")
   s.add_dependency("mail", ">= 2.8.1")