Update test.yml

Author: jhavl

.github/workflows/test.yml

@@ -49,7 +49,7 @@ jobs:
         pytest --cov=roboticstoolbox --cov-report xml:coverage.xml
         coverage report
     - name: upload coverage to Codecov
-      uses: codecov/codecov-action@master
+      uses: codecov/codecov-action@v3
       with:
         file: ./coverage.xml
   sphinx: