[py] Using build and twine

Author: diemol

.github/workflows/nightly.yml

@@ -47,7 +47,8 @@ jobs:
       cache-key: python-nightly
       run: |
         ./go "py:version[nightly]"
-        ./go py:release
+        ./go py:build
+        twine upload --repository testpypi bazel-bin/py/selenium-4*.whl bazel-bin/py/selenium-4*.tar.gz
     secrets: inherit