Bug 1638190 [wpt PR 23626] - Update interfaces/webauthn.idl, a=testonly

Automatic update from web-platform-tests
Update interfaces/webauthn.idl (#23626)

Source: https://github.com/tidoust/reffy-reports/blob/8de5e63/ed/idl/webauthn.idl
Build: https://travis-ci.org/tidoust/reffy-reports/builds/687251575
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wpt-commits: 5905cf051f2bc87beab2c7ebc4aac361a59dbf60
wpt-pr: 23626

testing/web-platform/tests/interfaces/webauthn.idl

@@ -31,6 +31,9 @@ interface AuthenticatorResponse {
 interface AuthenticatorAttestationResponse : AuthenticatorResponse {
     [SameObject] readonly attribute ArrayBuffer      attestationObject;
     sequence<DOMString>                              getTransports();
+    ArrayBuffer                                      getAuthenticatorData();
+    ArrayBuffer?                                     getPublicKey();
+    COSEAlgorithmIdentifier                          getPublicKeyAlgorithm();
 };
 
 [SecureContext, Exposed=Window]