Fix callback state not updating from executor events due to UUID type mismatch

[wjddn279]

failing test: https://github.com/apache/airflow/actions/runs/26440894620/job/77843758833?pr=66141

When filtering a UUID-typed column on the existing Callback table with a plain string, the following error is raised. This error does not surface on PostgreSQL, but it does on SQLite and MySQL.

FAILED airflow-core/tests/unit/jobs/test_scheduler_job.py::TestSchedulerJob::test_process_executor_events_failed_event_captures_output[queued] - sqlalchemy.exc.StatementError: (builtins.AttributeError) 'str' object has no attribute 'hex'
[SQL: SELECT callback.id AS callback_id, callback.type AS callback_type, callback.fetch_method AS callback_fetch_method, callback.data AS callback_data, callback.bundle_name AS callback_bundle_name, callback.state AS callback_state, callback.output AS callback_output, callback.priority_weight AS callback_priority_weight, callback.created_at AS callback_created_at, callback.trigger_id AS callback_trigger_id 
FROM callback 
WHERE callback.id = %s]
[parameters: [{'pk_1': '019e63b5-0c8e-7749-b423-236d64f5a623'}]]

The fix wraps the lookup value in UUID(...) instead of passing the raw string.

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