Updated the codecov action to the latest version

Author: agronholm

.github/workflows/test.yml

@@ -48,6 +48,6 @@ jobs:
         coverage run -m pytest -W always
         coverage xml
     - name: Send coverage data to Codecov
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
         file: coverage.xml