fix quotes

.github/workflows/build.yml

@@ -40,7 +40,7 @@ jobs:
   upload_pypi:
     needs: [build_wheels, build_sdist]
     runs-on: ubuntu-latest
-    if: github.event_name == "push" && startsWith(github.ref, "refs/tags")
+    if: github.event_name == 'push' && startsWith(github.ref, 'refs/tags')
     steps:
       - uses: actions/download-artifact@v2
         with: