Update Europeana endpoint

[stacimc]

Fixes

Fixes WordPress/openverse#1727 by @dravadhis

Description

This PR updates the Europeana DAG to use the new API endpoint under https://api.europeana.eu/ as noted in the docs.

Happily I believe no additional changes were necessary. The API documentation is quite good and I was able to confirm all the fields we're using are present and unchanged, including the cursor based pagination.

Testing Instructions

Tests should all continue to pass.

Try running the Europeana DAG locally and verify the script still works. For more thorough testing I did the following:

1. Set an INGESTION_LIMIT of 200
2. Run the DAG until it completes ingestion for a day with a good amount of data. 2022-11-04 had 200+ rows.
3. Find the tsv for your test day in the MinIO console and download it
4. Checkout main and repeat steps 1-3 with the old API endpoint. Make sure you run ingestion for the same day. You can trigger a manual DagRun with a conf set to {"date": "2022-11-04"}
5. Once you have both tsvs downloaded, compare them to make sure they are identical:

$ cmp --silent file1 file2 && echo 'Success' || echo 'Failure: Files are different'

Checklist

• My pull request has a descriptive title (not a vague title like
  Update index.md).
• My pull request targets the default branch of the repository (main) or
  a parent feature branch.
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no visible
  errors.
• I ran the DAG documentation generator (if applicable).

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[zackkrida]

Great! The DAG works locally.

[AetherUnbound]

Wow, I'm pleased it was such a small change 😄 I tested using your instructions and everything matched 💯

[krysal]

Glad that it is just a small change! The docstring also needs an update of the endpoint for preventing any confusion in the future.

[stacimc]

The docstring also needs an update of the endpoint for preventing any confusion in the future.

Good catch, thank you @krysal! I updated the docstring to link to the documentation for the new endpoint.

[krysal]

Thank you!