fix(ci/release/publish): skip-existing=true for testPyPi (trobleshooting upload failures with 400 Bad Request)

Author: hleb-rubanau

.github/workflows/release.yml

@@ -144,3 +144,4 @@ jobs:
         with:
           repository-url: https://test.pypi.org/legacy
           verbose: true
+          skip-existing: true