Deprecate the SSE transport #2681

Job	Run time
checks / pre-commit	37s
checks / readme-snippets	14s
checks / test (3.10, lowest-direct, windows-latest)	1m 40s
checks / test (3.10, locked, ubuntu-latest)	56s
checks / test (3.10, lowest-direct, ubuntu-latest)	58s
checks / test (3.12, locked, windows-latest)	1m 29s
checks / test (3.11, locked, windows-latest)	1m 28s
checks / test (3.11, lowest-direct, windows-latest)	1m 20s
checks / test (3.10, locked, windows-latest)	1m 13s
checks / test (3.11, locked, ubuntu-latest)	49s
checks / test (3.11, lowest-direct, ubuntu-latest)	52s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, windows-latest)	1m 22s
checks / test (3.12, locked, ubuntu-latest)	52s
checks / test (3.13, lowest-direct, ubuntu-latest)	54s
checks / test (3.14, lowest-direct, ubuntu-latest)	52s
checks / test (3.13, locked, ubuntu-latest)	44s
checks / test (3.14, lowest-direct, windows-latest)	1m 15s
checks / test (3.14, locked, windows-latest)	2m 9s
checks / test (3.13, locked, windows-latest)	1m 12s
checks / test (3.14, locked, ubuntu-latest)	1m 53s
checks / test (3.13, lowest-direct, windows-latest)	1m 29s
all-green	4s
	25m 23s

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