spring.security.saml2.relyingparty.registration.*.asserting-party.* properties contain unwanted hyphen in asserting-party

[wilkinsona]

We try to avoid hyphens in property prefixes, reserving their use for the property's name. To align with this, spring.security.saml2.relyingparty.registration.*.asserting-party.* should be spring.security.saml2.relyingparty.registration.*.assertingparty.*.

[mhalbritter]

When the 2.7.0 changelog is written, please change the note from RC 1, which still uses asserting-party to assertingparty.