gh-action: Fix Codecov

Add token for Codecov to fixe problem:
"Rate limit reached. Please upload with the Codecov repository upload token to resolve issue"

Signed-off-by: Tim Zhang <tim@hyper.sh>

Author: Tim-Zhang

.github/workflows/cov.yml

@@ -16,7 +16,9 @@ jobs:
       - name: Generate code coverage
         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
+        env:
+          CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
         with:
           files: lcov.info
           fail_ci_if_error: true