Fix up some dev-requirements for the reviewbot worker.
Review Request #14892 — Created March 9, 2026 and submitted — Latest diff uploaded
We were depending on a very old version of pytest-env inside the
worker's dev-requirements.txt file, causing docs builds on CI to fail to
properly set up. We also had a bunch of obsolete stuff for old versions
of Python we no longer support. This change simplifies and updates the
dev-requirements file.
Installed from this file.