Fix deprecation warning

Author: Tobias-Fischer

.github/workflows/main.yml

@@ -73,6 +73,6 @@ jobs:
         micromamba run -n myenv coverage report
         micromamba run -n myenv coverage xml
     - name: upload coverage to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         file: ./coverage.xml