build(deps): upgrade rubygem-deps

Ruby 2.x has passed its end of life and is now unsupported.

.github/workflows/ci.yml

@@ -19,10 +19,6 @@ jobs:
   build:
     runs-on: ubuntu-latest
 
-    strategy:
-      matrix:
-        ruby: [2.7, 3]
-
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -32,7 +28,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: ${{ matrix.ruby }}
+          ruby-version: 3
           bundler-cache: true
 
       - name: Setup Node

jekyll-theme-chirpy.gemspec

@@ -23,12 +23,12 @@ Gem::Specification.new do |spec|
     "plugin_type"       => "theme"
   }
 
-  spec.required_ruby_version = ">= 2.6"
+  spec.required_ruby_version = ">= 3.0"
 
   spec.add_runtime_dependency "jekyll", "~> 4.3"
   spec.add_runtime_dependency "jekyll-paginate", "~> 1.1"
   spec.add_runtime_dependency "jekyll-redirect-from", "~> 0.16"
-  spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.7"
+  spec.add_runtime_dependency "jekyll-seo-tag", "~> 2.8"
   spec.add_runtime_dependency "jekyll-archives", "~> 2.2"
   spec.add_runtime_dependency "jekyll-sitemap", "~> 1.4"
   spec.add_runtime_dependency "jekyll-include-cache", "~> 0.2"