[webauthn] new commits pushed by agl

The following commits were just pushed by agl to https://github.com/w3c/webauthn:

* Add "hybrid" as a transport.

FIDO has chosen the name Hybrid for the transport formerly known as
caBLE. This change adds it as a known transport in WebAuthn. Since the
`AuthenticatorTransport` enum is illustrative and not actually
referenced anywhere in the IDL, this is technically a non-normative
change. Also, RPs only store and regurgitate these strings so no change
in RP processing is needed. Still, it's useful to have these strings
documented.
  by Adam Langley
https://github.com/w3c/webauthn/commit/656e61356345c709292b6b2fcaaff7a57a82bf33



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