Use codecov-action@v4 with CODECOV_TOKEN

Signed-off-by: matt-ramotar <[email protected]>

Author: matt-ramotar

.github/workflows/codecov.yml

@@ -5,8 +5,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@master
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
         with:
+          token: ${{ secrets.CODECOV_TOKEN }}
           files: ./kover/coverage.xml
           name: codecov-umbrella
           verbose: true