Drop support for Python 3.9

[eladkal]

Discussion: https://lists.apache.org/thread/0th63mgfc51jy7bch032hskbgoyzyhs2

Lazy consensus: https://lists.apache.org/thread/5b3w2ofb2hjqcszkd21sg815rc0yxovt

[potiuk]

👀

[potiuk]

Prepare all required actions
Getting action download info
Download immutable action package 'actions/setup-python@v5'
  Version: 5.6.0
  Digest: sha[2](https://github.com/apache/airflow/actions/runs/15819890437/job/44586552024?pr=52072#step:5:2)56:0b35a0c11c97499e4e05765890[3](https://github.com/apache/airflow/actions/runs/15819890437/job/44586552024?pr=52072#step:5:3)6d450b9f5f9da74b7774225b3614b57324404
  Source commit SHA: a26af69be951a213d[4](https://github.com/apache/airflow/actions/runs/15819890437/job/44586552024?pr=52072#step:5:4)95a4c3e4e4022e16d8706[5](https://github.com/apache/airflow/actions/runs/15819890437/job/44586552024?pr=52072#step:5:5)
Run ./.github/actions/breeze
Run actions/setup-python@v5
  with:
    python-version: 3.9
    check-latest: false
    token: ***
    update-environment: true
    allow-prereleases: false
    freethreaded: false

3.9 is also hard-coded in a few github action workflows where it had to be added by hand (because you cannot run breeze before you install breeze to check which version of python is supported :D ) .

Classic chicken-egg

[gopidesupavan]

Thanks Elad.

LGTM, mostly type changes ;)

[potiuk]

Looks good (minus the current failures of course so indeed we should merge it quickly) - reviewed with git diff (higjhly recommended over GitHub UI) - helped to fix some reds and looked over it few times already.

There will be cherry-pick issues, but it's inevitable and we should just let peopel know to pay attention to the kinds of changes that they are expected to "revert" when cherry-picking.

[amoghrajesh]

Looks fine to me. It mainly looks like type checking has had an impact, rest is pretty ok +1

[potiuk]

👀 👀 .... and I might be able to complete 3.13 as a follow up....

[potiuk]

Wooohoooo !

[gopidesupavan]

Cool :)

[jscheffl]

Cool!

[bugraoz93]

Awesome!