* Add parameter created_at for sg.upload

* create new ephemeral project on pipeline run

* use ephemeral project as control for schema visibility tests

* add update_certifi script to automate certifi update

* move scripts to dev folder

* update certifi to 2026.6.17

* SG-42847 update operators-and-arguments docs

* SG-42847 fix missing space

- Simplify the version guard in shotgun_api3/__init__.py to a single
  3.9 check, matching the pattern already adopted in tk-core.
- Remove the dead pre-3.8 branch in Shotgun._split_url(), which used
  the deprecated urllib.parse.splituser. setup.py already requires
  python_requires>=3.9.0, so both branches were unreachable.

Version bump following the SG-43906 Python 3.7/3.8 cleanup (shotgunsoftware#454),
so it can be published and picked up by tk-core's vendoring script.