Replace httpx and httpx-sse with httpx2 (#2972) #3476

Job	Run time
checks / docs	29s
checks / pre-commit	59s
checks / readme-snippets	14s
checks / test (3.10, locked, windows-latest)	1m 58s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.11, locked, ubuntu-latest)	1m 19s
checks / test (3.12, locked, ubuntu-latest)	1m 37s
checks / test (3.11, locked, windows-latest)	1m 58s
checks / test (3.10, locked, ubuntu-latest)	1m 31s
checks / test (3.10, lowest-direct, windows-latest)	2m 8s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.14, locked, ubuntu-latest)	1m 19s
checks / test (3.14, locked, windows-latest)	1m 49s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, lowest-direct, windows-latest)	2m 49s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 22s
checks / test (3.13, lowest-direct, windows-latest)	1m 51s
checks / test (3.13, locked, windows-latest)	2m 11s
checks / test (3.12, locked, windows-latest)	1m 51s
checks / test (3.12, lowest-direct, windows-latest)	1m 54s
checks / test (3.13, locked, ubuntu-latest)	1m 20s
checks / test (3.11, lowest-direct, windows-latest)	1m 50s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 25s
all-green	4s
	36m 7s

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