Replace httpx and httpx-sse with httpx2 #3474

Job	Run time
checks / readme-snippets	12s
checks / docs	35s
checks / pre-commit	56s
checks / test (3.12, lowest-direct, windows-latest)	1m 58s
checks / test (3.14, lowest-direct, windows-latest)	2m 0s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 20s
checks / test (3.14, locked, ubuntu-latest)	1m 16s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 24s
checks / test (3.11, lowest-direct, windows-latest)	2m 5s
checks / test (3.12, locked, ubuntu-latest)	1m 38s
checks / test (3.12, locked, windows-latest)	1m 19s
checks / test (3.10, locked, windows-latest)	2m 12s
checks / test (3.10, lowest-direct, windows-latest)	1m 34s
checks / test (3.14, locked, windows-latest)	1m 58s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 17s
checks / test (3.13, locked, windows-latest)	1m 50s
checks / test (3.13, lowest-direct, windows-latest)	2m 30s
checks / test (3.11, locked, windows-latest)	1m 50s
checks / test (3.13, locked, ubuntu-latest)	1m 15s
checks / test (3.10, locked, ubuntu-latest)	1m 30s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.11, locked, ubuntu-latest)	1m 20s
all-green	5s
	34m 32s

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