(ci) integration test, and pypdf version pin #281

Job	Run time
get-non-cloud-notebooks	10s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	7m 58s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	6m 16s
notebooks-except-cloud (docs/sphinx/source/advanced-configuration.ipynb)	6m 59s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	6m 31s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	5m 48s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	7m 42s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	5m 53s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	7m 10s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	2m 16s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	1m 54s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	1m 33s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	1m 17s
	1h 1m 27s

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