* ci: add Ruby 4.0

Author: palkan

.github/workflows/jruby-test.yml

@@ -16,7 +16,7 @@ jobs:
       BUNDLE_RETRY: 3
       CI: true
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: jruby

.github/workflows/rubocop.yml

@@ -12,12 +12,11 @@ jobs:
     env:
       BUNDLE_GEMFILE: gemfiles/rubocop.gemfile
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
-        ruby-version: 3.1
+        ruby-version: 3.4
         bundler-cache: true
     - name: Lint Ruby code with RuboCop
       run: |
         bundle exec rubocop
-

.github/workflows/test-edge.yml

@@ -24,7 +24,7 @@ jobs:
       CI: true
       REQUIRE_HOOKS_MODE: ${{ matrix.mode }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}

.github/workflows/test.yml

@@ -13,15 +13,15 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3]
+        ruby: [2.5, 2.6, 2.7, 3.0, 3.1, 3.2, 3.3, 3.4, 4.0]
         mode: ['auto', 'patch']
     env:
       BUNDLE_JOBS: 4
       BUNDLE_RETRY: 3
       CI: true
       REQUIRE_HOOKS_MODE: ${{ matrix.mode }}
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}

.github/workflows/truffle-test.yml

@@ -18,7 +18,7 @@ jobs:
       TRUFFLERUBYOPT: "--engine.Mode=latency"
       CI: true
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v6
     - uses: ruby/setup-ruby@v1
       with:
         ruby-version: truffleruby-head