Pin CI actions and test Ruby 4

.github/workflows/release.yml

@@ -14,11 +14,11 @@ jobs:
       id-token: write
     environment: release
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
         with:
           persist-credentials: false
-      - uses: ruby/setup-ruby@v1
+      - uses: ruby/setup-ruby@003a5c4d8d6321bd302e38f6f0ec593f77f06600 # v1.319.0
         with:
           ruby-version: ruby
           bundler-cache: true
-      - uses: rubygems/release-gem@v1
+      - uses: rubygems/release-gem@052cc82692552de3ef2b81fd670e41d13cba8092 # v1.4.0

.github/workflows/test.yml

@@ -12,12 +12,12 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ["3.2", "3.3", "3.4"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
 
       - name: Set up Ruby ${{ matrix.ruby }}
-        uses: ruby/setup-ruby@v1
+        uses: ruby/setup-ruby@003a5c4d8d6321bd302e38f6f0ec593f77f06600 # v1.319.0
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true