Update codecov in tests.yml (#10)

Author: antonvorobets

.github/workflows/tests.yml

@@ -19,6 +19,6 @@ jobs:
           environment-file: requirements.yml
       - run: pytest --cov=entropy_pooling --cov-fail-under=100 --cov-report=xml
       - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v3
-        env:
-          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+        uses: codecov/codecov-action@v4.0.1
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}