CI: add Ruby 3.3 to the test matrix

.github/workflows/test.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2' ]
+        ruby: [ '2.4', '2.5', '2.6', '2.7', '3.0', '3.1', '3.2', '3.3' ]
         gemfile: [ 'faraday_1.10.0', 'faraday_2.1.0', 'faraday_2.2.0', 'faraday_2.3.0', 'jwt_1.5.6', 'jwt_2.2.3', 'jwt_2.3.0', 'jwt_2.4.1' ]
         exclude:
           - { ruby: '2.4', gemfile: 'faraday_2.1.0' }
@@ -25,7 +25,7 @@ jobs:
     env: # $BUNDLE_GEMFILE must be set at the job level, so it is set for all steps
       BUNDLE_GEMFILE: ${{ github.workspace }}/gemfiles/${{ matrix.gemfile }}.gemfile
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
         with: