(ci) integration test, and pypdf version pin #279

Job	Run time
get-non-cloud-notebooks	4s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	11m 54s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	5m 58s
notebooks-except-cloud (docs/sphinx/source/advanced-configuration.ipynb)	8m 57s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	7m 28s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	6m 53s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	6m 47s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	7m 31s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	5m 51s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	11m 7s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	5m 51s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	6m 25s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	4m 25s
	1h 29m 11s

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