Add support for Python 3.13-3.14 and drop support EOL 3.7-3.9

[hugovk]

See https://devguide.python.org/versions/

Python 3.7 is no longer available on GitHub Actions:

• https://github.com/hugovk/sniffio/actions/runs/13589302770
• Version 3.7 was not found in the local cache actions/setup-python#962 (comment)

[hugovk]

Updated to add support for Python 3.14.

[hugovk]

Updated to drop support for EOL Python 3.9.

[cclauss]

Can we revert this change and also the change on line 7 so that we can get this test to pass? It passes on:

• Add Python 3.13, 3.14, and free threaded 3.14t to the testing #55

[hugovk]

Done! But also it looks like no-one is merging anything here, and I normally close year-old PRs.

Is it likely this might be merged, given also #54 and #55?

[bowiechen]

I closed #54 to deduplicate this effort.

[A5rocks]

Unfortunately I didn't have this repo watched ^^

I'd personally prefer to merge #55 given someone else is reviewing it. I haven't actually looked at the contents of PRs to know if there's concrete differences though.

[cclauss]

I have reviewed this and approved.

[cclauss]

Git conflicts...

If you rebase and add https://github.com/re-actors/alls-green then @A5rocks can remove the Requirements tags and we can git this merged.

[hugovk]

Git conflicts...

If you rebase

Rebased!

and add re-actors/alls-green

@cclauss Please could you send a PR to my branch with this?

[A5rocks]

Not a PR but see https://github.com/python-trio/trio/blob/main/.github/workflows/ci.yml#L475 for how Trio uses that

[A5rocks]

Hm, why this change?

[cclauss]

Allows maintainers to run to tests on demand.

• https://docs.github.com/en/actions/reference/workflows-and-actions/events-that-trigger-workflows#workflow_dispatch

[hugovk]

It adds the missing button to the UI to let you manually trigger a build from https://github.com/python-trio/sniffio/actions/workflows/ci.yml

It will look something like:

You don't need it very often, but when you do, it's annoying to if it's not been enabled yet!

[cclauss]

Run re-actors/alls-green@release/v1
Run python -m normalize_needed_jobs_status \
# ✓ All of the required dependency jobs succeeded 🎉🎉🎉

📝 Job statuses:
📝 Windows → ✓ success [required to succeed]
📝 Ubuntu → ✓ success [required to succeed]
📝 macOS → ✓ success [required to succeed]
0s

[A5rocks]

Just some formatting comments

[hugovk]

Thanks both!