bump: ci: add ruby 4.0

Author: stackmystack

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.2, 3.3, 3.4]
+        ruby: [3.2, 3.3, 3.4, 4.0]
         platform:
           - { os: ubuntu, target: linux-x64, extension: so }
           - { os: macos, target: macos-arm64, extension: bundle }
@@ -75,7 +75,7 @@ jobs:
       - name: setup ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
       - name: Lint
         run: just lint
@@ -88,7 +88,7 @@ jobs:
       - name: setup ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
       - name: Typecheck
         run: just tc

.github/workflows/publish-docs.yml

@@ -36,7 +36,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.4
+          ruby-version: 4.0
           bundler-cache: true
 
       - name: Generate docs