chore: exclude internal modules from Maven Central publishing #133

Job	Run time
Client Conformance (elicitation-sep1034-client-defaults)	1m 36s
Client Conformance (tools_call)	1m 44s
Client Conformance (initialize)	1m 42s
Client Conformance (sse-retry)	1m 39s
Server Conformance	1m 56s
Auth Conformance (auth/metadata-var2)	1m 52s
Auth Conformance (auth/scope-step-up)	1m 50s
Auth Conformance (auth/scope-from-scopes-supported)	1m 39s
Auth Conformance (auth/basic-cimd)	1m 50s
Auth Conformance (auth/scope-from-www-authenticate)	1m 33s
Auth Conformance (auth/token-endpoint-auth-basic)	1m 43s
Auth Conformance (auth/metadata-default)	1m 34s
Auth Conformance (auth/pre-registration)	1m 42s
Auth Conformance (auth/metadata-var1)	1m 37s
Auth Conformance (auth/scope-retry-limit)	1m 42s
Auth Conformance (auth/scope-omitted-when-undefined)	1m 43s
Auth Conformance (auth/token-endpoint-auth-none)	1m 53s
Auth Conformance (auth/token-endpoint-auth-post)	1m 44s
Auth Conformance (auth/metadata-var3)	1m 38s
	32m 37s

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