Bump version of codecov action.

This updates to codecov-action@v3.

Author: davidt

.github/workflows/test.yml

@@ -69,6 +69,6 @@ jobs:
         DJANGO: ${{ matrix.django-version }}
 
     - name: Upload coverage
-      uses: codecov/codecov-action@v1
+      uses: codecov/codecov-action@v3
       with:
         name: Python ${{ matrix.python-version }}