Switch Async HTTP-client to `httpx` (HTTP/2-support) #33

Job	Run time
get-non-cloud-notebooks	5s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	6m 43s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	5m 30s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	11m 24s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	5m 37s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	24m 47s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	8m 33s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	7m 50s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	8m 16s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	5m 45s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	9m 15s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	6m 18s
	1h 40m 3s

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