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Bump actions/setup-java from 4 to 6 #936

Job	Run time
Server Conformance	53s
Auth Conformance (auth/metadata-var2)	51s
Client Conformance (initialize)	44s
Auth Conformance (auth/token-endpoint-auth-basic)	37s
Client Conformance (sse-retry)	1m 1s
Client Conformance (tools_call)	39s
Modern Server Conformance (2026-07-28)	1m 5s
Auth Conformance (auth/token-endpoint-auth-post)	46s
Client Conformance (elicitation-sep1034-client-defaults)	30s
Auth Conformance (auth/scope-from-scopes-supported)	1m 9s
Auth Conformance (auth/metadata-var1)	50s
Auth Conformance (auth/token-endpoint-auth-none)	52s
Auth Conformance (auth/metadata-default)	51s
Auth Conformance (auth/basic-cimd)	45s
Auth Conformance (auth/metadata-var3)	47s
Auth Conformance (auth/scope-step-up)	1m 1s
Auth Conformance (auth/scope-from-www-authenticate)	50s
Auth Conformance (auth/scope-omitted-when-undefined)	53s
Auth Conformance (auth/scope-retry-limit)	34s
Auth Conformance (auth/pre-registration)	57s
	16m 35s