[Openid-specs-risc] [openid/sharedsignals] 8e8bd8: update stream exists to 409

[Tim Cappalli]

  Branch: refs/heads/tc-46-streamexists
  Home:   https://github.com/openid/sharedsignals
  Commit: 8e8bd8ea199b51b25b5b8d79967cbe52e6115dc3
      https://github.com/openid/sharedsignals/commit/8e8bd8ea199b51b25b5b8d79967cbe52e6115dc3
  Author: Tim Cappalli <tim at cloudauth.dev>
  Date:   2023-08-01 (Tue, 01 Aug 2023)

  Changed paths:
    M openid-sharedsignals-framework-1_0.md

  Log Message:
  -----------
  update stream exists to 409