Fix outdated GitHub Action

Author: sibprogrammer

.github/workflows/test.yml

@@ -6,6 +6,6 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - run: docker-compose run tests
-      - run: bash <(curl -s https://codecov.io/bash)
+      - run: bash <(curl -s https://codecov.io/bash)