Revert cloudbuild python version (#220)

[See MM](https://chat.kaggle.net/kaggle/pl/7w3xqjdq7jfo7jm5qsws5pkqno)
for more details

Author: goeffthomas

tools/release/cloudbuild.yaml

@@ -120,6 +120,8 @@ steps:
 
 substitutions:
   _GITHUB_REPOSITORY: kagglehub
-  _PYTHON_VERSION: 3.9.19
+  # Before changing this, ensure there's a matching tag for our bre-built hatch image:
+  # https://pantheon.corp.google.com/artifacts/docker/kaggle-cicd/us/tools/hatch?e=13803378&mods=-ai_platform_fake_service&project=kaggle-cicd
+  _PYTHON_VERSION: 3.9.18
   _NEW_VERSION: default