for logout request on OpenID Connect it is possible to send an optional
state parameter. The
OidcLogoutActionBuilder however is never setting this parameter. I excpected the state generator of the client to create the state value which would then be passed to the LogoutRequest. Instead "null" is set as the state. For comparison the
SAML2LogoutActionBuilder is using the state genarator for its relay state, so I exptected the same mechanism for OIDC.