Fix warning for github build

* Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3.
* also remove support for obsolete Ruby 2.7

Author: geekq

.github/workflows/test.yml

@@ -14,10 +14,10 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [2.7, 3.1, 3.3]
+        ruby: [3.1, 3.3]
     steps:
       - name: Checkout code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with: