Generate table of active Python releases #2862
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Description
Generate the table of active Python releases.
This means we can remove another manual step from the release process.
Get the releases data from the PEPs API: https://peps.python.org/api/#release-cycle-json
We were using another PEPs API file -- https://peps.python.org/api/#python-releases-json -- elsewhere. Let's refactor that to use the other one, because the file is a bit smaller.
Before
https://www.python.org/downloads/
After
And because this is getting up-to-date data from the API, it's more accurate. For example, I had initially copied and pasted the wrong 3.15 first release date (2026-10-07) when it's really 2026-10-01.