Fix infinite reconnection loop in StreamableHTTP client #1782

Job	Run time
checks / readme-snippets	11s
checks / pre-commit	30s
checks / test (3.10, lowest-direct, ubuntu-latest)	59s
checks / test (3.11, lowest-direct, windows-latest)	2m 33s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.10, locked, windows-latest)	3m 0s
checks / test (3.10, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 2s
checks / test (3.10, lowest-direct, windows-latest)	2m 34s
checks / test (3.11, locked, ubuntu-latest)	47s
checks / test (3.12, locked, ubuntu-latest)	1m 1s
checks / test (3.12, locked, windows-latest)	3m 27s
checks / test (3.11, locked, windows-latest)	2m 48s
checks / test (3.12, lowest-direct, windows-latest)	3m 35s
checks / test (3.13, lowest-direct, ubuntu-latest)	51s
checks / test (3.14, lowest-direct, windows-latest)	2m 6s
checks / test (3.13, lowest-direct, windows-latest)	2m 28s
checks / test (3.13, locked, ubuntu-latest)	49s
checks / test (3.14, locked, ubuntu-latest)	2m 16s
checks / test (3.13, locked, windows-latest)	2m 29s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 13s
checks / test (3.14, locked, windows-latest)	3m 11s
all-green	4s
	39m 47s

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