Use Ruby 3.4 and update Nokogiri

Author: rosa

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
       - name: Setup Ruby and install gems
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.0
+          ruby-version: 3.4
           bundler-cache: true
       - name: Run rubocop
         run: |

Gemfile.lock

@@ -86,11 +86,11 @@ GEM
     mutex_m (0.3.0)
     mysql2 (0.5.6)
     nio4r (2.7.4)
-    nokogiri (1.16.7-arm64-darwin)
+    nokogiri (1.18.0-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.7-x86_64-darwin)
+    nokogiri (1.18.0-x86_64-darwin)
       racc (~> 1.4)
-    nokogiri (1.16.7-x86_64-linux)
+    nokogiri (1.18.0-x86_64-linux-gnu)
       racc (~> 1.4)
     parallel (1.26.3)
     parser (3.3.6.0)