Merge pull request #140 from jwodder/dependabot/github_actions/codecov/codecov-action-4

[gh-actions](deps): Bump codecov/codecov-action from 3 to 4

Author: jwodder

.github/workflows/test.yml

@@ -90,10 +90,11 @@ jobs:
         run: cargo llvm-cov --all-features --lcov --output-path lcov.info
 
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           files: lcov.info
           fail_ci_if_error: false
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   lint:
     runs-on: ubuntu-latest