Fix integration tests for `roots/list` #701

Job	Run time
Server Conformance	55s
Client Conformance (initialize)	53s
Client Conformance (elicitation-sep1034-client-defaults)	49s
Client Conformance (sse-retry)	52s
Client Conformance (tools_call)	39s
Auth Conformance (auth/metadata-var3)	48s
Auth Conformance (auth/token-endpoint-auth-none)	44s
Auth Conformance (auth/metadata-default)	47s
Auth Conformance (auth/scope-retry-limit)	51s
Auth Conformance (auth/scope-from-www-authenticate)	44s
Auth Conformance (auth/basic-cimd)	40s
Auth Conformance (auth/token-endpoint-auth-basic)	51s
Auth Conformance (auth/pre-registration)	50s
Auth Conformance (auth/metadata-var2)	1m 2s
Auth Conformance (auth/metadata-var1)	52s
Auth Conformance (auth/scope-step-up)	46s
Auth Conformance (auth/scope-from-scopes-supported)	50s
Auth Conformance (auth/scope-omitted-when-undefined)	50s
Auth Conformance (auth/token-endpoint-auth-post)	52s
	15m 35s

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