use ruby 3.1

.github/workflows/build.yml

@@ -28,9 +28,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
       - name: Setup Ruby
-        uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+        uses: ruby/setup-ruby@8a45918450651f5e4784b6031db26f4b9f76b251 # v1.150.0
         with:
-          ruby-version: '3.0' # Not needed with a .ruby-version file
+          ruby-version: '3.1'
           bundler-cache: true # runs 'bundle install' and caches installed gems automatically
       - name: Setup Pages
         id: pages