Merge pull request #164 from OMS-NetZero/codecov

Update checks.yml

Author: chrisroadmap

.github/workflows/checks.yml

@@ -54,7 +54,8 @@ jobs:
       # we could run the notebook tests, but we probably don't want to do this every
       # time and use all our minutes.
     - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         verbose: true
         file: ./coverage.xml
+        token: ${{ secrets.CODECOV_TOKEN }}