refactor: import SSEError from httpx_sse public API (#2560) #2077

Job	Run time
checks / pre-commit	34s
checks / readme-snippets	10s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, ubuntu-latest)	55s
checks / test (3.10, locked, windows-latest)	2m 41s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 0s
checks / test (3.10, lowest-direct, windows-latest)	2m 37s
checks / test (3.12, lowest-direct, windows-latest)	3m 33s
checks / test (3.11, locked, windows-latest)	3m 3s
checks / test (3.11, locked, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, windows-latest)	3m 9s
checks / test (3.12, locked, ubuntu-latest)	54s
checks / test (3.12, locked, windows-latest)	3m 58s
checks / test (3.13, lowest-direct, ubuntu-latest)	58s
checks / test (3.13, locked, windows-latest)	2m 44s
checks / test (3.14, locked, windows-latest)	3m 14s
checks / test (3.13, locked, ubuntu-latest)	50s
checks / test (3.13, lowest-direct, windows-latest)	2m 12s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.14, locked, ubuntu-latest)	2m 21s
checks / test (3.14, lowest-direct, windows-latest)	2m 34s
all-green	3s
	41m 39s

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