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]

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

indeed :)

[potiuk]

ALMOST ... -> the (reverted) main issue AND one static check - sorting imports !!!

VERY, VERY CLOSE :)

[amoghrajesh]

Very very close! I will take another look when CI is green!

[eladkal]

Very very close! I will take another look when CI is green!

It's very hard to keep this PR green. For example the current failure is new, it started today and the fix applied in #52321 is insufficient for Python 3.10 because we need TypeAlias.

Kindly asking reviewers to review early so we can merge this fast.

[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!