Remove the unsupported WebSocket transport #2538

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	35s
checks / test (3.10, lowest-direct, ubuntu-latest)	56s
checks / test (3.11, lowest-direct, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, windows-latest)	1m 21s
checks / test (3.10, locked, ubuntu-latest)	48s
checks / test (3.12, locked, ubuntu-latest)	56s
checks / test (3.10, locked, windows-latest)	1m 13s
checks / test (3.10, lowest-direct, windows-latest)	1m 27s
checks / test (3.11, locked, windows-latest)	1m 16s
checks / test (3.14, locked, windows-latest)	2m 24s
checks / test (3.14, lowest-direct, ubuntu-latest)	47s
checks / test (3.11, locked, ubuntu-latest)	48s
checks / test (3.13, lowest-direct, windows-latest)	1m 26s
checks / test (3.13, lowest-direct, ubuntu-latest)	49s
checks / test (3.12, locked, windows-latest)	1m 32s
checks / test (3.14, lowest-direct, windows-latest)	1m 10s
checks / test (3.12, lowest-direct, windows-latest)	1m 6s
checks / test (3.12, lowest-direct, ubuntu-latest)	54s
checks / test (3.13, locked, ubuntu-latest)	48s
checks / test (3.14, locked, ubuntu-latest)	1m 51s
checks / test (3.13, locked, windows-latest)	1m 17s
all-green	5s
	24m 36s

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