Config: declare support for Shib IdP 2.4.x
Config: declare support for Shib IdP 2.4.x

Declare support for Shib IdP 2.4.x as part of Shib 2.3.x IdP to avoid
confusion when users are looking specifically for 2.4.x.

ausaccessfed/federationregistry,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,ausaccessfed/federationregistry,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,University-of-Auckland/federationregistry2-Tuakiri,REANNZ/federationregistry2-Tuakiri,ausaccessfed/federationregistry,ausaccessfed/federationregistry