Switch Async HTTP-client to `httpx` (HTTP/2-support) #35

Job	Run time
get-non-cloud-notebooks	4s
notebooks-except-cloud (docs/sphinx/source/application-packages.ipynb)	7m 26s
notebooks-except-cloud (docs/sphinx/source/query.ipynb)	7m 13s
notebooks-except-cloud (docs/sphinx/source/getting-started-pyvespa.ipynb)	11m 26s
notebooks-except-cloud (docs/sphinx/source/examples/cross-encoders-for-global-reranking.ipynb)	7m 30s
notebooks-except-cloud (docs/sphinx/source/examples/evaluating-with-snowflake-arctic-embed.ipynb)	6m 8s
notebooks-except-cloud (docs/sphinx/source/examples/pyvespa-examples.ipynb)	13m 9s
notebooks-except-cloud (docs/sphinx/source/examples/multi-vector-indexing.ipynb)	6m 30s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical-mapping.ipynb)	5m 50s
notebooks-except-cloud (docs/sphinx/source/examples/lightgbm-with-categorical.ipynb)	5m 27s
notebooks-except-cloud (docs/sphinx/source/examples/feed_performance.ipynb)	8m 20s
notebooks-except-cloud (docs/sphinx/source/reads-writes.ipynb)	19m 47s
	1h 38m 50s

Provide feedback