Revert "Prioritize custom serializers over built-in ones. (#56736)" #57711
+25
−78
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Reverts #56881
Suspect this broke CI in https://github.com/apache/airflow/actions/runs/19009115530 - openeing a reversion to check CI - if it turns green then serde.py had somehow a negative effect... which I do not understand as of now.