Add Ruby 4 to CI matrix

Signed-off-by: William Woodruff <william@yossarian.net>

Author: woodruffw

.github/workflows/tests.yml

@@ -14,31 +14,31 @@ jobs:
     strategy:
       matrix:
         platform: ["ubuntu-latest", "macos-latest"]
-        ruby: ["3.2", "3.3", "3.4"]
+        ruby: ["3.2", "3.3", "3.4", "4.0"]
     runs-on: ${{ matrix.platform }}
     steps:
-    - name: Set up Git repository
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
-      with:
-        persist-credentials: false
+      - name: Set up Git repository
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+        with:
+          persist-credentials: false
 
-    - name: Set up Ruby
-      uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
-      with:
-        ruby-version: ${{ matrix.ruby }}
-        bundler-cache: true
+      - name: Set up Ruby
+        uses: ruby/setup-ruby@90be1154f987f4dc0fe0dd0feedac9e473aa4ba8 # v1.286.0
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
 
-    - name: Run tests
-      env:
-        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
-      run: bundle exec rake
+      - name: Run tests
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        run: bundle exec rake
 
-    - name: Run RuboCop
-      run: bundle exec rubocop -D lib/
+      - name: Run RuboCop
+        run: bundle exec rubocop -D lib/
 
-    - name: Upload coverage results
-      uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de # v5.5.2
-      with:
-        files: coverage/coverage.xml
-        disable_search: true
-        token: ${{ secrets.CODECOV_TOKEN }}
+      - name: Upload coverage results
+        uses: codecov/codecov-action@671740ac38dd9b0130fbe1cec585b89eea48d3de # v5.5.2
+        with:
+          files: coverage/coverage.xml
+          disable_search: true
+          token: ${{ secrets.CODECOV_TOKEN }}