fix workflow

Author: Yakuhito

.github/workflows/rust.yml

@@ -35,11 +35,6 @@ jobs:
       - name: Run tests
         run: cargo tarpaulin --release --workspace --all-features --out xml
 
-      - name: Upload coverage reports to Codecov
-        uses: codecov/codecov-action@v4.0.1
-        with:
-          token: ${{ secrets.CODECOV_TOKEN }}
-
       - name: Cleanup coverage reports
         run: rm -f cobertura.xml