amoghrajesh opened a new pull request, #44469:
URL: https://github.com/apache/airflow/pull/44469

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   @eladkal recently ran into an issue:
   ```
   Downloading constraints for all Airflow versions for Python 3.9
   
   Downloading 
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.0/constraints-3.9.txt
 to 
/Users/eladkal/PycharmProjects/airflow/.build/constraints/constraints-2.0.0-python-3.9.txt
   
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.0/constraints-3.9.txt
 could not be downloaded. Status code 403
   Could not download constraints for Airflow 2.0.0 and Python 3.9
   Downloading 
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.1/constraints-3.9.txt
 to 
/Users/eladkal/PycharmProjects/airflow/.build/constraints/constraints-2.0.1-python-3.9.txt
   
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.1/constraints-3.9.txt
 could not be downloaded. Status code 403
   Could not download constraints for Airflow 2.0.1 and Python 3.9
   Downloading 
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.2/constraints-3.9.txt
 to 
/Users/eladkal/PycharmProjects/airflow/.build/constraints/constraints-2.0.2-python-3.9.txt
   
https://raw.githubusercontent.com/apache/airflow/constraints-2.0.2/constraints-3.9.txt
 could not be downloaded. Status code 403
   Could not download constraints for Airflow 2.0.2 and Python 3.9
   Downloading 
https://raw.githubusercontent.com/apache/airflow/constraints-2.1.0/constraints-3.9.txt
 to 
/Users/eladkal/PycharmProjects/airflow/.build/constraints/constraints-2.1.0-python-3.9.txt
   
https://raw.githubusercontent.com/apache/airflow/constraints-2.1.0/constraints-3.9.txt
 could not be downloaded. Status code 403
   Could not download constraints for Airflow 2.1.0 and Python 3.9
   ....
   ```
   Then
   
   ```
   multiprocessing.pool.RemoteTraceback:
   """
   Traceback (most recent call last):
     File 
"/Users/eladkal/.local/share/rtx/installs/python/3.11.6/lib/python3.11/multiprocessing/pool.py",
 line 125, in worker
       result = (True, func(*args, **kwds))
                       ^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/rtx/installs/python/3.11.6/lib/python3.11/multiprocessing/pool.py",
 line 48, in mapstar
       return list(map(*args))
              ^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/PycharmProjects/airflow/dev/breeze/src/airflow_breeze/utils/provider_dependencies.py",
 line 83, in generate_providers_metadata_for_package
       if constraints[airflow_version].get(package_name) == provider_version:
          ~~~~~~~~~~~^^^^^^^^^^^^^^^^^
   KeyError: '2.0.0'
   """
   
   The above exception was the direct cause of the following exception:
   
   Traceback (most recent call last):
     File "/Users/eladkal/.local/bin/breeze", line 8, in <module>
       sys.exit(main())
                ^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/rich_click/rich_command.py",
 line 367, in __call__
       return super().__call__(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/click/core.py",
 line 1157, in __call__
       return self.main(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/rich_click/rich_command.py",
 line 152, in main
       rv = self.invoke(ctx)
            ^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/click/core.py",
 line 1688, in invoke
       return _process_result(sub_ctx.command.invoke(sub_ctx))
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/click/core.py",
 line 1688, in invoke
       return _process_result(sub_ctx.command.invoke(sub_ctx))
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/click/core.py",
 line 1434, in invoke
       return ctx.invoke(self.callback, **ctx.params)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/uv/tools/apache-airflow-breeze/lib/python3.11/site-packages/click/core.py",
 line 783, in invoke
       return __callback(*args, **kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/PycharmProjects/airflow/dev/breeze/src/airflow_breeze/commands/release_management_commands.py",
 line 2614, in generate_providers_metadata
       results = pool.map(
                 ^^^^^^^^^
     File 
"/Users/eladkal/.local/share/rtx/installs/python/3.11.6/lib/python3.11/multiprocessing/pool.py",
 line 367, in map
       return self._map_async(func, iterable, mapstar, chunksize).get()
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
     File 
"/Users/eladkal/.local/share/rtx/installs/python/3.11.6/lib/python3.11/multiprocessing/pool.py",
 line 774, in get
       raise self._value
   KeyError: '2.0.0'
   ```
   
   On debugging we realised that its because of VPN! This revealed that we do 
not handle 403 well. This PR fixes that
   
   <!-- Please keep an empty line above the dashes. -->
   ---
   **^ Add meaningful description above**
   Read the **[Pull Request 
Guidelines](https://github.com/apache/airflow/blob/main/contributing-docs/05_pull_requests.rst#pull-request-guidelines)**
 for more information.
   In case of fundamental code changes, an Airflow Improvement Proposal 
([AIP](https://cwiki.apache.org/confluence/display/AIRFLOW/Airflow+Improvement+Proposals))
 is needed.
   In case of a new dependency, check compliance with the [ASF 3rd Party 
License Policy](https://www.apache.org/legal/resolved.html#category-x).
   In case of backwards incompatible changes please leave a note in a 
newsfragment file, named `{pr_number}.significant.rst` or 
`{issue_number}.significant.rst`, in 
[newsfragments](https://github.com/apache/airflow/tree/main/newsfragments).
   


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