Add Ruby 4.0 to test matrix

.github/workflows/ci.yml

@@ -11,7 +11,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        ruby: ["3.4", "3.3", "3.2"]
+        ruby: ["4.0", "3.4", "3.3", "3.2"]
 
     name: Tests - Ruby ${{ matrix.ruby }}
     # Set the type of machine to run on
@@ -38,7 +38,7 @@ jobs:
       - name: Bundle install
         run: |
           bundle config path vendor/bundle
-          bundle install --jobs 4 --retry 3 --without development
+          bundle install --jobs 8 --retry 3 --without development
 
       - name: Run tests
         run: |

.github/workflows/rubocop.yml

@@ -12,12 +12,12 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: "3.4"
+          ruby-version: "4.0"
           bundler-cache: true
 
       - name: Run rubocop