chore(ci): upgrade to codecov v4

Author: thomasrockhu-codecov

.github/workflows/ci.yml

@@ -5,7 +5,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
       - name: Set up Python 3.10
         uses: actions/setup-python@v4
         with:
@@ -15,6 +15,6 @@ jobs:
       - name: Run tests and collect coverage
         run: pytest --cov app
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4.0.0-beta.2
+        uses: codecov/codecov-action@v4
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}