Bump codecov/codecov-action from 4 to 5 (#53)

Author: dependabot[bot]

.github/workflows/main.yml

@@ -60,4 +60,4 @@ jobs:
         run: tox -e test -- --cov=./ --cov-report=xml
 
       - name: Upload coverage reports of tests.
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5