ci: use codecov-action v4

Author: gdesmott

.github/workflows/ci.yml

@@ -96,8 +96,9 @@ jobs:
       - name: Generate code coverage
         run: cargo llvm-cov --all-features --workspace --lcov --output-path lcov.info
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v3
+        uses: codecov/codecov-action@v4
         with:
           token: ${{ secrets.CODECOV_TOKEN }} # not required for public repos
           files: lcov.info
-          fail_ci_if_error: true
+          fail_ci_if_error: true
+          verbose: true