conformance: update to mcp-security 0.1.5, pass scope-step-up #274

Job	Run time
Client Conformance (initialize)	1m 3s
Client Conformance (elicitation-sep1034-client-defaults)	1m 22s
Client Conformance (tools_call)	57s
Server Conformance	1m 4s
Client Conformance (sse-retry)	1m 12s
Auth Conformance (auth/metadata-var3)	1m 10s
Auth Conformance (auth/scope-from-www-authenticate)	1m 6s
Auth Conformance (auth/token-endpoint-auth-none)	1m 1s
Auth Conformance (auth/scope-retry-limit)	1m 2s
Auth Conformance (auth/scope-step-up)	1m 0s
Auth Conformance (auth/token-endpoint-auth-basic)	58s
Auth Conformance (auth/scope-from-scopes-supported)	54s
Auth Conformance (auth/token-endpoint-auth-post)	59s
Auth Conformance (auth/scope-omitted-when-undefined)	1m 10s
Auth Conformance (auth/metadata-default)	1m 6s
Auth Conformance (auth/pre-registration)	1m 5s
Auth Conformance (auth/basic-cimd)	1m 1s
Auth Conformance (auth/metadata-var1)	58s
Auth Conformance (auth/metadata-var2)	1m 16s
	20m 24s

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