Fix integration tests for `roots/list` #699

Job	Run time
Server Conformance	50s
Client Conformance (initialize)	40s
Auth Conformance (auth/metadata-var3)	48s
Client Conformance (sse-retry)	46s
Client Conformance (elicitation-sep1034-client-defaults)	44s
Auth Conformance (auth/token-endpoint-auth-post)	1m 9s
Auth Conformance (auth/basic-cimd)	31s
Auth Conformance (auth/scope-omitted-when-undefined)	51s
Auth Conformance (auth/scope-from-scopes-supported)	54s
Client Conformance (tools_call)	43s
Auth Conformance (auth/scope-step-up)	49s
Auth Conformance (auth/token-endpoint-auth-none)	43s
Auth Conformance (auth/metadata-var2)	50s
Auth Conformance (auth/token-endpoint-auth-basic)	54s
Auth Conformance (auth/pre-registration)	54s
Auth Conformance (auth/scope-retry-limit)	43s
Auth Conformance (auth/metadata-var1)	47s
Auth Conformance (auth/scope-from-www-authenticate)	55s
Auth Conformance (auth/metadata-default)	51s
	15m 22s

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