Fix typo in McpSession.cs (#371) #115

Job	Run time
build (ubuntu-latest, Debug)	3m 4s
build (ubuntu-latest, Release)	2m 34s
build (windows-latest, Release)	5m 18s
build (windows-latest, Debug)	5m 17s
build (macos-latest, Debug)	1m 15s
build (macos-latest, Release)	1m 16s
publish-coverage	-1s
	18m 43s

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