github actions runners have python 3.12, so the upgrade to debian
stable's 3.13 broke things:
+ env UV_PYTHON=python uv --no-managed-python lock --check --exclude-newer=2026-02-01T13:00:00Z
Using CPython 3.12.3 interpreter at: /usr/bin/python
error: The requested interpreter resolved to Python 3.12.3, which is incompatible with the project's Python requirement: `>=3.13` (from `project.requires-python`)
Error: Process completed with exit code 2.
Steps:
1. edit pyproject.toml and
2. uv lock --upgrade --exclude-newer="$(awk -F'"' <uv.lock '/^exclude-newer[[:space:]]*=/ {print $2}')"
In future we should maybe use managed python?
sphinx==9.1.0 depends on Python>=3.12,
so change our pinning policy to fit.
Note we still support Python 3.9 in user-facing code.
Steps:
1. edit updatecli.d/python.yml
2. remove bad "uv lock" from build_tools/update-dependencies.sh
(didn't respect exclude-newer)
3. updatecli apply --config updatecli.d/python.yml
4. uv lock --upgrade --exclude-newer="$(date --date='7 days ago' --iso-8601)"
In future, we should ask "renovatebot" to update these version. I
don't have an opinion on whether to use "uv" or something else, but
I think we do want lockfiles, and I don't know of a natural way to
install Sphinx via Cargo.
No particular reason for this Python version.
Part of #11996
