Update .github/workflows/CI.yml

Co-authored-by: David Widmann <[email protected]>

Author: andreasnoack

.github/workflows/CI.yml

@@ -59,6 +59,8 @@ jobs:
       - uses: julia-actions/julia-processcoverage@v1
       - uses: codecov/codecov-action@v4
         with:
+          token: ${{ secrets.CODECOV_TOKEN }} # required
+          fail_ci_if_error: true
           files: lcov.info
   docs:
     name: Documentation