ashb opened a new pull request, #53149:
URL: https://github.com/apache/airflow/pull/53149

   And move airflow.utils.timezone into a (vendored) shared library as the 
first example of it working
   
   Currently various places in TaskSDK and Airflow Core both use these utility 
functions, and while in _this specific case_ they are small enough that they 
could just be copied and the duplication wouldn't hurt us long term, this 
changes shows a way in which we can have a single source of truth, but have it 
copied in automatically to dists.
   
   This uses the `vendoring` too from one of the pip authors and a hatch plugin 
to need only a single copy checked in to the repo, but to have automatically 
copied in at package (sdist or wheel) build time.
   
   A lot of the reasoning and mode of operation of this is detailed in 
shared/README.md in this PR, hence why this description is so short.
   
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