[WebOTP] Update idls to use the WICG git repo

Bug: None
Change-Id: I3dcd551fcc2412e728c600235b3bb4af44af561f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321398Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792059}

third_party/blink/renderer/modules/credentialmanager/otp_credential.idl

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://github.com/samuelgoto/WebOTP
+// https://github.com/WICG/web-otp/
 [
     RuntimeEnabled=SmsReceiver,
     Exposed=Window,

third_party/blink/renderer/modules/credentialmanager/otp_credential_request_options.idl

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-// https://github.com/samuelgoto/WebOTP
+// https://github.com/WICG/web-otp/
 
 enum OTPCredentialTransportType {
   "sms"