Check for consistency of various Python versions

[grahamalama]

We have a few Python versions defined throughout the repo:

> rg "3\.11" -g '!*.rst' -g '!.git/*' --hidden

.readthedocs.yaml
6:    python: "3.11"

.circleci/config.yml
236:      - image: cimg/python:3.11.2
252:      - image: cimg/python:3.11.2
263:      - image: cimg/python:3.11.2

poetry.lock
3378:python-versions = "^3.11"

pyproject.toml
50:python = "^3.11"

RemoteSettings.Dockerfile
1:FROM python:3.11.3 as compile
30:FROM python:3.11.3-slim as production

IntegrationTests.Dockerfile
1:FROM python:3.11.3-slim as build
20:FROM python:3.11.3-slim

• some versions are pinned to the minor version, and some are pinned to the patch
• sometimes the versions drift. In the output above, we can see that the Dockerfile Python versions are at 3.11.3, while the cimg tags are at 3.11.2. At the time of writing this issue, there is no cimg/python:3.11.3 tag

We should ensure internal consistency for these various Python versions, if possible. We should also alert ourselves when things drift out of sync.

[leplatrem]

I put pyproject.toml:python = ">=3.11, <3.13" in #514

But since the container is 3.12, maybe it wouldn't be a bad idea to force the developers to use the same version, even though there's no real obligation