Use codecov token to upload

Author: dstansby

.github/workflows/test_and_deploy.yml

@@ -58,6 +58,8 @@ jobs:
 
       - name: Coverage
         uses: codecov/codecov-action@v3
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   deploy:
     # this will run when you have tagged a commit, starting with "v*"