[Openid-specs-risc] [openid/sharedsignals] c1270c: Remove 'format' from stream config

[FragLegs]

  Branch: refs/heads/add-format
  Home:   https://github.com/openid/sharedsignals
  Commit: c1270ccf87bc7606ea95181baaf150ba09694e15
      https://github.com/openid/sharedsignals/commit/c1270ccf87bc7606ea95181baaf150ba09694e15
  Author: Shayne Miel <smiel at duosecurity.com>
  Date:   2023-08-29 (Tue, 29 Aug 2023)

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

  Log Message:
  -----------
  Remove 'format' from stream config