chore(ci): upgrade to v4

Author: thomasrockhu-codecov

.github/workflows/ci.yml

@@ -17,6 +17,6 @@ jobs:
       - name: Run tests and collect coverage
         run: pytest --cov app
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4-beta
+        uses: codecov/codecov-action@v4
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_ORG_TOKEN }}