fix coverage

.github/workflows/pull_request.yml

@@ -148,7 +148,7 @@ jobs:
       - name: coverage
         if: ${{ matrix.compiler == 'gcc-9.2' && matrix.os == 'ubuntu2004' }}
         run: |
-            ~/.local/bin/fastcov -d build -l -o fastcov.info -p --exclude /usr/include --exclude parser/scanner.lex --exclude=/opt/vesoft
+            ~/.local/bin/fastcov -d build -l -o fastcov.info -p --exclude /usr/include --exclude=/opt/vesoft --exclude scanner.lex
             bash <(curl -s https://codecov.io/bash) -Z -f fastcov.info
       - name: Sanitizer
         if: ${{ always() }}