ci(test.yml): set version v3 to actions/checkout

Author: oscard0m

.github/workflows/test.yml

@@ -1,20 +1,22 @@
 name: Test
-on:
+"on":
   push:
     branches:
       - main
   pull_request:
-    types: [opened, synchronize]
-
+    types:
+      - opened
+      - synchronize
 jobs:
   test_matrix:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        node_version: ["12", "14"]
-
+        node_version:
+          - "12"
+          - "14"
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - name: Use Node.js ${{ matrix.node_version }}
         uses: actions/setup-node@v2
         with:
@@ -28,9 +30,6 @@ jobs:
             ${{ runner.os }}-node-
       - run: npm ci
       - run: npm test
-
-  # The "test" step can be required in branch protection and does not
-  # change each time the test matrix changes.
   test:
     runs-on: ubuntu-latest
     needs: test_matrix