Deprecate `httpx` in favor of `httpx2` #2277

Job	Run time
checks / pre-commit	35s
checks / readme-snippets	12s
checks / test (3.12, lowest-direct, windows-latest)	3m 32s
checks / test (3.10, lowest-direct, windows-latest)	2m 40s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, locked, windows-latest)	2m 16s
checks / test (3.13, lowest-direct, ubuntu-latest)	44s
checks / test (3.11, lowest-direct, windows-latest)	2m 42s
checks / test (3.12, locked, ubuntu-latest)	1m 1s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.12, locked, windows-latest)	3m 33s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, locked, ubuntu-latest)	2m 26s
checks / test (3.14, lowest-direct, windows-latest)	2m 20s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 49s
checks / test (3.10, locked, ubuntu-latest)	51s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 5s
checks / test (3.11, locked, windows-latest)	2m 41s
all-green	5s
	40m 1s

Provide feedback