chore(deps): update actions/checkout action to v3 (#74)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

.github/workflows/tests.yml

@@ -18,7 +18,7 @@ jobs:
         node-version: [14.x]
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
 
       - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v2