Unfccc-di-api

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* Use the latest data release which switched to a single parquet file for all data.

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* Re-release 4.0.2 due to technical reasons.

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* Use data released until 2024-07-04 when using the ZenodoReader.

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* Use data released until 2024-01-08 when using the ZenodoReader.
* Support python 3.12.

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* Breaking: the UNFCCC restricted API access, likely you have to change your code to
use the new ZenodoReader instead.
* Add ZenodoReader which doesn't rely on API access.
* Use data released until 2023-07-18 when using the ZenodoReader.
* Build the documentation on ReadTheDocs using newer Python and Sphinx versions.

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* Support python 3.11.
* Drop support for python 3.6.