Lightning-AI / Lightning-AI/pytorch-lightning

Deprecate Python 3.9 support + Add Python 3.14

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ci refactor
Dominant language
Python
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Avg merge
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Description

### Outline & Motivation

Python 3.9 has status end-of-life as of oct. 25 so lets deprecate support for it.
Lets instead add support for Python 3.14

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

### Pitch

_No response_

### Additional context

_No response_

cc @borda @lantiga @justusschock

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

The issue names no files, tests, or entry points. Start by locating the project's Python-version configuration and CI definitions, then identify every place that declares supported versions. Done means Python 3.9 support is deprecated and Python 3.14 support is added consistently, with relevant checks passing.

Written by the indexing model from the issue text.

Assessment

Tech stack
python
Domain
build-system
Issue type
Feature
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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