Pin GitHub Actions to commit SHAs

Author: github-security-bot

.github/dependabot.yml

@@ -0,0 +1,8 @@
+version: 2
+updates:
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "weekly"
+    cooldown:
+      default-days: 7

.github/workflows/ci.yml

@@ -29,9 +29,9 @@ jobs:
     env:
       RAILS_VERSION: ${{ matrix.rails-version }}
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@11d5960a326750d5838078e36cf38b85af677262 # v4.4.0
     - name: Set up Ruby
-      uses: ruby/setup-ruby@v1
+      uses: ruby/setup-ruby@95ef2b042f9d7a56d8268cba8559e2842e2ad01b # v1.321.0
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true