Fix infinite reconnection loop in StreamableHTTP client #1783

Job	Run time
checks / pre-commit	33s
checks / readme-snippets	12s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.10, lowest-direct, windows-latest)	2m 36s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.12, lowest-direct, windows-latest)	4m 8s
checks / test (3.10, locked, ubuntu-latest)	53s
checks / test (3.11, lowest-direct, ubuntu-latest)	54s
checks / test (3.10, locked, windows-latest)	2m 27s
checks / test (3.11, locked, ubuntu-latest)	52s
checks / test (3.11, lowest-direct, windows-latest)	2m 50s
checks / test (3.12, locked, windows-latest)	3m 35s
checks / test (3.11, locked, windows-latest)	2m 40s
checks / test (3.13, lowest-direct, windows-latest)	2m 41s
checks / test (3.14, lowest-direct, windows-latest)	2m 18s
checks / test (3.13, locked, windows-latest)	2m 41s
checks / test (3.12, locked, ubuntu-latest)	58s
checks / test (3.14, locked, windows-latest)	3m 12s
checks / test (3.13, locked, ubuntu-latest)	47s
checks / test (3.13, lowest-direct, ubuntu-latest)	53s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.14, locked, ubuntu-latest)	2m 23s
all-green	4s
	41m 1s

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