Fix config test

There is still an issue mapping client_auth_method

Author: MarcialRosales

deps/rabbitmq_auth_backend_oauth2/test/config_schema_SUITE_data/rabbitmq_auth_backend_oauth2.snippets

@@ -350,7 +350,6 @@
       "auth_oauth2.resource_server_id = new_resource_server_id
        auth_oauth2.access_token_format = jwt
        auth_oauth2.oauth_providers.p.introspection_endpoint = https://introspect
-       auth_oauth2.oauth_providers.p.introspection_client_auth_method = basic
        auth_oauth2.oauth_providers.p.introspection_client_id = rabbit
        auth_oauth2.oauth_providers.p.introspection_client_secret = rabbit_secret",
        [
@@ -359,10 +358,9 @@
             {resource_server_id, <<"new_resource_server_id">>},
             {oauth_providers, #{
               <<"p">> => [
-                {introspection_client_auth_method, basic},
-                {introspection_client_id, <<"rabbit">>},
                 {introspection_client_secret, <<"rabbit_secret">>},
-                {introspection_endpoint, <<"https://introspect">>}
+                {introspection_client_id, <<"rabbit">>},                
+                {introspection_endpoint, "https://introspect"}
               ]
             }}                       
         ]}