[Refactor] Update rest schemas to be compatible with marshmallow 4.X

[jrobinAV]

📌 Description

https://marshmallow.readthedocs.io/en/stable/upgrading.html#implicit-field-creation-is-removed

The release 4.0 of the marshmallow package has a breaking change that prevents us from upgrading our dependency. Update rest code (taipy/rest/api/schemas/datanode.py) to be compatible.

📜 Code of Conduct

• I have checked the existing issues to avoid duplicates.
• I am willing to work on this issue (optional)

✅ Acceptance Criteria

• The refactored code maintains existing functionality without breaking changes.
• Any new code is covered by unit tests.
• Code coverage remains at least 90%.
• Performance improvements are documented, if applicable.