Update test.yml

Use checkout v3

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
       image: erlang:${{ matrix.otp_version }}
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Compile
         run: make
       - name: Test