[airflow] branch v2-1-test updated (a51e9a8 -> d12fe3c)

[as...@apache.org]

This is an automated email from the ASF dual-hosted git repository.

ash pushed a change to branch v2-1-test
in repository https://gitbox.apache.org/repos/asf/airflow.git.


 discard a51e9a8  Update default versions v2-1-test in the 2.1 branch
     add ea7e64f  Relax required version for `python-telegram-bot` (#15776)
     add d78f8c5  Remove unused constant in serialization code (#15824)
     add 8ab9c0c  Ensure that task preceeding a PythonVirtualenvOperator doesn't fail (#15822)
     add d12fe3c  Update default versions v2-1-test in the 2.1 branch

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 * -- * -- B -- O -- O -- O   (a51e9a8)
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             N -- N -- N   refs/heads/v2-1-test (d12fe3c)

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No new revisions were added by this update.

Summary of changes:
 airflow/models/dag.py                       |  9 ++-------
 airflow/operators/python.py                 |  5 +++++
 airflow/serialization/serialized_objects.py |  9 ---------
 setup.py                                    |  2 +-
 tests/operators/test_python.py              | 13 +++++++++++++
 5 files changed, 21 insertions(+), 17 deletions(-)