Use actions/checkout@v3

Author: hsbt

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
         ruby: [ head, "3.1", "3.0", "2.7", "2.6" ]
     steps:
       - name: repo checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: load ruby
         uses: ruby/setup-ruby@v1
@@ -41,7 +41,7 @@ jobs:
         ruby: [ mswin, mingw, "3.1", "3.0", "2.7", "2.6" ]
     steps:
       - name: repo checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v3
 
       - name: load ruby, install/update gcc, install openssl
         uses: MSP-Greg/setup-ruby-pkgs@v1