DRAFT - Fix StdioClientTransport missing charset #301

Job	Run time
Client Conformance (sse-retry)	48s
Client Conformance (initialize)	45s
Server Conformance	53s
Client Conformance (elicitation-sep1034-client-defaults)	47s
Client Conformance (tools_call)	40s
Auth Conformance (auth/metadata-default)	45s
Auth Conformance (auth/metadata-var3)	46s
Auth Conformance (auth/basic-cimd)	50s
Auth Conformance (auth/token-endpoint-auth-basic)	40s
Auth Conformance (auth/scope-step-up)	50s
Auth Conformance (auth/scope-retry-limit)	50s
Auth Conformance (auth/scope-omitted-when-undefined)	43s
Auth Conformance (auth/metadata-var2)	49s
Auth Conformance (auth/scope-from-www-authenticate)	51s
Auth Conformance (auth/token-endpoint-auth-post)	53s
Auth Conformance (auth/token-endpoint-auth-none)	47s
Auth Conformance (auth/pre-registration)	47s
Auth Conformance (auth/scope-from-scopes-supported)	50s
Auth Conformance (auth/metadata-var1)	50s
	15m 4s

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