Fix type annotations in `feed_data_point` #362

Job	Run time
get-non-cloud-notebooks	3s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	11m 48s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	7m 1s
notebooks-except-cloud (docs/sphinx/source/advanced-configuration.ipynb)	8m 20s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	7m 23s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	5m 45s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	9m 27s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	6m 26s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	7m 46s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	9m 51s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	6m 18s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	7m 57s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	5m 4s
	1h 33m 9s

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