Update Ruby to 4.0 and Rails to 8.0

.github/workflows/main.yml

@@ -12,9 +12,8 @@ jobs:
     strategy:
       matrix:
         ruby:
-          - 2.6
-          - 2.7
-          - 3.0
+          - 3.4
+          - 4.0
 
     steps:
     - uses: actions/checkout@v4
@@ -36,7 +35,7 @@ jobs:
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.0
+        ruby-version: 4.0
         bundler-cache: true
     - name: Set up Chrome
       uses: browser-actions/setup-chrome@v1