fix: find enc key

[TimoGlastra]

Not sure we want to merge this, but it's needed for interop as HAIP does not define restrictions on this

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[TimoGlastra]

I think we should merge this after all, as it's the currently expected behavior in HAIP. I think the priority makes sense, falling back to less specific

Issue in oid4vp: openid/OpenID4VP#438