Update ci.yml (#276)

Author: joaquimg

.github/workflows/ci.yml

@@ -37,9 +37,10 @@ jobs:
         env:
           DATADEPS_ALWAYS_ACCEPT: true # For MLDatasets.MNIST
       - uses: julia-actions/julia-processcoverage@v1
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
           file: lcov.info
+          token: ${{ secrets.CODECOV_TOKEN }}
   docs:
     name: Documentation
     runs-on: ubuntu-latest