[Openid-specs-fapi] Issue #675: update refs for HTTP Message Signatures & Digest Fields (openid/fapi)

[Brian Campbell]

New issue 675: update refs for HTTP Message Signatures & Digest Fields
https://bitbucket.org/openid/fapi/issues/675/update-refs-for-http-message-signatures

Brian Campbell:

HTTP Message Signatures and Digest Fields have just been published as RFCs 9421 & 9530 so the references in FAPI 2.0 Message Signing can be updated. 

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[https://mailarchive.ietf.org/arch/msg/rfc-dist/5zaFde1ttqND9S3DyirblYNd9ow/](https://mailarchive.ietf.org/arch/msg/rfc-dist/5zaFde1ttqND9S3DyirblYNd9ow/) 

[https://www.rfc-editor.org/info/rfc9421](https://www.rfc-editor.org/info/rfc9421)

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[https://mailarchive.ietf.org/arch/msg/rfc-dist/NHcS-Oj7i1mxddkUzTYcT1dQz28/](https://mailarchive.ietf.org/arch/msg/rfc-dist/NHcS-Oj7i1mxddkUzTYcT1dQz28/)

[https://www.rfc-editor.org/info/rfc9530](https://www.rfc-editor.org/info/rfc9530)