Fix broken tests due to pymysql 1.2.0 incompat with aiomysql

[amoghrajesh]

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Fix for CI like: https://github.com/apache/airflow/actions/runs/26391986239/job/77689459612?pr=67460 and in main too

Current behaviour

pymysql 1.2.0 changed the default of Connection.ping(reconnect) from True to False.
SQLAlchemy's _send_false_to_ping memoized property inspects this signature — when it sees
reconnect=False it switches to calling dbapi_connection.ping() with no arguments.

But SQLAlchemy's AsyncAdapt_aiomysql_connection.ping(self, reconnect: bool) has no default for
reconnect, so the bare call raises a TypeError every time the async connection pool runs a
pre-ping health check (pool_pre_ping=True).

Error looks like this:

_____________________________________________________________________________________ TestSession.test_async_session _____________________________________________________________________________________
airflow-core/tests/unit/utils/test_session.py:66: in test_async_session
    my_special_log_event = await session.scalar(select(Log).where(Log.event == "hihi1234").limit(1))
/usr/python/lib/python3.10/site-packages/sqlalchemy/ext/asyncio/session.py:505: in scalar
    return await greenlet_spawn(
/usr/python/lib/python3.10/site-packages/sqlalchemy/util/_concurrency_py3k.py:203: in greenlet_spawn
    result = context.switch(value)
/usr/python/lib/python3.10/site-packages/sqlalchemy/orm/session.py:2399: in scalar
    return self._execute_internal(
/usr/python/lib/python3.10/site-packages/sqlalchemy/orm/session.py:2239: in _execute_internal
    conn = self._connection_for_bind(bind)
/usr/python/lib/python3.10/site-packages/sqlalchemy/orm/session.py:2108: in _connection_for_bind
    return trans._connection_for_bind(engine, execution_options)
<string>:2: in _connection_for_bind
    ???
/usr/python/lib/python3.10/site-packages/sqlalchemy/orm/state_changes.py:137: in _go
    ret_value = fn(self, *arg, **kw)
/usr/python/lib/python3.10/site-packages/sqlalchemy/orm/session.py:1187: in _connection_for_bind
    conn = bind.connect()
/usr/python/lib/python3.10/site-packages/sqlalchemy/engine/base.py:3293: in connect
    return self._connection_cls(self)
/usr/python/lib/python3.10/site-packages/sqlalchemy/engine/base.py:143: in __init__
    self._dbapi_connection = engine.raw_connection()
/usr/python/lib/python3.10/site-packages/sqlalchemy/engine/base.py:3317: in raw_connection
    return self.pool.connect()
/usr/python/lib/python3.10/site-packages/sqlalchemy/pool/base.py:448: in connect
    return _ConnectionFairy._checkout(self)
/usr/python/lib/python3.10/site-packages/sqlalchemy/pool/base.py:1371: in _checkout
    with util.safe_reraise():
/usr/python/lib/python3.10/site-packages/sqlalchemy/util/langhelpers.py:121: in __exit__
    raise exc_value.with_traceback(exc_tb)
/usr/python/lib/python3.10/site-packages/sqlalchemy/pool/base.py:1309: in _checkout
    result = pool._dialect._do_ping_w_event(
/usr/python/lib/python3.10/site-packages/sqlalchemy/engine/default.py:729: in _do_ping_w_event
    return self.do_ping(dbapi_connection)
/usr/python/lib/python3.10/site-packages/sqlalchemy/dialects/mysql/pymysql.py:123: in do_ping
    dbapi_connection.ping()
E   TypeError: AsyncAdapt_aiomysql_connection.ping() missing 1 required positional argument: 'reconnect'

Solution

Cap pymysql<1.2 in the mysql provider's dependencies until SQLAlchemy's aiomysql adapter is
updated to handle the new signature.

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[amoghrajesh]

Lets run with full tests to be sure

[github-actions]

Backport failed to create: v3-2-test. View the failure log Run details

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Status	Branch	Result
❌	v3-2-test

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cherry_picker 7ea8362 v3-2-test

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cherry_picker --continue

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