Fixed syntax error in github action

Author: lukebaumann

.github/workflows/build_wheel.yml

@@ -79,7 +79,7 @@ jobs:
 
   publish-to-pypi:
     name: Publish Python distribution to PyPI
-    if: !inputs.testpypi && startsWith(github.ref, 'refs/tags/') # only publish to PyPI on tag pushes
+    if: "!inputs.testpypi && startsWith(github.ref, 'refs/tags/')" # only publish to PyPI on tag pushes
     needs:
     - build
     runs-on: ubuntu-latest