Deprecate `httpx` in favor of `httpx2` #2279

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	35s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, lowest-direct, ubuntu-latest)	57s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.10, locked, ubuntu-latest)	58s
checks / test (3.11, lowest-direct, ubuntu-latest)	57s
checks / test (3.14, lowest-direct, windows-latest)	2m 36s
checks / test (3.14, locked, ubuntu-latest)	2m 30s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 7s
checks / test (3.11, locked, windows-latest)	2m 40s
checks / test (3.13, locked, windows-latest)	2m 20s
checks / test (3.12, lowest-direct, windows-latest)	4m 30s
checks / test (3.13, lowest-direct, ubuntu-latest)	57s
checks / test (3.10, locked, windows-latest)	2m 36s
checks / test (3.10, lowest-direct, windows-latest)	2m 33s
checks / test (3.11, lowest-direct, windows-latest)	3m 4s
checks / test (3.12, locked, windows-latest)	3m 37s
checks / test (3.13, lowest-direct, windows-latest)	2m 42s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.14, locked, windows-latest)	3m 10s
all-green	5s
	41m 44s

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