Work around github actions python failure

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?

updatecli.d/python.yml

@@ -5,6 +5,7 @@ sources:
     kind: shell
     spec:
       command: |
+        # TODO github actions might not have this
         build_tools/version-available-in-debian.sh stable python3-defaults
   sphinx_version:
     kind: shell