use codecov v4; add token

Author: dwhswenson

.github/workflows/test-suite.yml

@@ -70,6 +70,8 @@ jobs:
         run: |
           python -c "import paths_cli"
           py.test -vv --cov --cov-report xml:cov.xml
-      - uses: codecov/codecov-action@v2
+      - uses: codecov/codecov-action@v4
         with:
           files: ./cov.xml
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}