Deprecate `httpx` in favor of `httpx2` #2287

Job	Run time
checks / pre-commit	36s
checks / readme-snippets	15s
checks / test (3.11, lowest-direct, windows-latest)	2m 55s
checks / test (3.12, locked, windows-latest)	3m 28s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.12, lowest-direct, windows-latest)	3m 46s
checks / test (3.14, locked, ubuntu-latest)	2m 28s
checks / test (3.14, locked, windows-latest)	3m 21s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, lowest-direct, windows-latest)	2m 50s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.13, locked, windows-latest)	2m 32s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 3s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.14, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, locked, windows-latest)	2m 40s
checks / test (3.12, locked, ubuntu-latest)	1m 3s
checks / test (3.10, locked, windows-latest)	2m 36s
checks / test (3.13, lowest-direct, windows-latest)	2m 59s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 14s
all-green	3s
	41m 52s

Provide feedback