Remove the unsupported WebSocket transport (#2785) #2575

Job	Run time
checks / readme-snippets	16s
checks / pre-commit	34s
checks / test (3.11, locked, windows-latest)	1m 16s
checks / test (3.10, locked, windows-latest)	2m 32s
checks / test (3.10, lowest-direct, ubuntu-latest)	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	58s
checks / test (3.10, locked, ubuntu-latest)	49s
checks / test (3.13, lowest-direct, windows-latest)	1m 27s
checks / test (3.14, locked, ubuntu-latest)	1m 52s
checks / test (3.13, locked, ubuntu-latest)	45s
checks / test (3.14, lowest-direct, windows-latest)	1m 38s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.11, lowest-direct, ubuntu-latest)	50s
checks / test (3.14, locked, windows-latest)	2m 24s
checks / test (3.13, locked, windows-latest)	1m 22s
checks / test (3.14, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, locked, ubuntu-latest)	46s
checks / test (3.11, lowest-direct, windows-latest)	1m 25s
checks / test (3.10, lowest-direct, windows-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	1m 50s
checks / test (3.12, locked, windows-latest)	1m 25s
checks / test (3.12, locked, ubuntu-latest)	49s
all-green	3s
	26m 48s

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