Bump codecov/codecov-action from 1 to 3 (#334)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -44,7 +44,7 @@ jobs:
           pytest --cov=./ --cov-report=xml
 
       - name: Upload code coverage to Codecov
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v3
         with:
           file: ./coverage.xml
           flags: unittests