from attribute in response wrongly named

[floriangantner]

Package version (if known): since 2.2.1

Describe the bug

Responses on the oai-pmh api with the from parameter in the request returns some from_ attribute in the response.

Steps to Reproduce

1. Tested on invenioRDM13 running on Zenodo view-source:https://zenodo.org/oai2d?verb=ListRecords&metadataPrefix=oai_datacite&until=2024-11-12&from=2022-11-11
2. Tested on our university repository running invenioRDM12 view-source:https://fd-repo.uni-bamberg.de/oai2d?verb=ListRecords&metadataPrefix=oai_datacite&until=2024-11-12&from=2024-11-11
3. Check the Response in xml element request. It should contain from_

Expected behavior

The attribute from_ does not appear in the xml schema of the oai-pmh2 specification https://www.openarchives.org/OAI/openarchivesprotocol.html#OAIPMHschema .
We expect the attribute to be from instead of from_.

Screenshots (if applicable)

Response (Zenodo)

Additional context

there was some previous fix caf2a95 for the from parameter which was not processed at all. We assume that this problem occurs from the reserved name of the python variable and might be some serialization issue.