allow dc+sd-jwt without cnf claim

[ragnika]

Minor update to remove the cnf claim requirement when creating an SD JWT VC

[linasi]

@ragnika could you please provide a link to the spec that describes this scenario?

[ragnika]

@ragnika could you please provide a link to the spec that describes this scenario?

spec

cnf: OPTIONAL unless cryptographic Key Binding is to be supported, in which case it is REQUIRED. Contains the confirmation method identifying the proof of possession key as defined in [RFC7800]. It is RECOMMENDED that this contains a JWK as defined in Section 3.2 of [RFC7800]. For proof of cryptographic Key Binding, the KB-JWT in the presentation of the SD-JWT MUST be secured by the key identified in this claim.