Remove the unsupported WebSocket transport #2535

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	40s
checks / test (3.10, locked, ubuntu-latest)	40s
checks / test (3.10, lowest-direct, windows-latest)	1m 17s
checks / test (3.10, lowest-direct, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, windows-latest)	1m 18s
checks / test (3.10, locked, windows-latest)	1m 31s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.11, locked, windows-latest)	2m 26s
checks / test (3.12, lowest-direct, ubuntu-latest)	51s
checks / test (3.13, locked, ubuntu-latest)	46s
checks / test (3.12, locked, ubuntu-latest)	53s
checks / test (3.13, lowest-direct, windows-latest)	1m 29s
checks / test (3.12, lowest-direct, windows-latest)	1m 25s
checks / test (3.13, locked, windows-latest)	1m 12s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.14, lowest-direct, windows-latest)	1m 19s
checks / test (3.14, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, locked, windows-latest)	1m 24s
checks / test (3.14, locked, ubuntu-latest)	1m 52s
checks / test (3.14, locked, windows-latest)	1m 57s
all-green	4s
	25m 17s

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