Erin Shepherd
5641b0b3ad
If a user has had a key rotation, and nobody on this server follows that user, we will not receive the Update activity with the new key Therefore, when we encounter key validation errors we should check for an up-to-date key. References (other implementations): * [Mastodon](https://github.com/mastodon/mastodon/blob/fc9ab61448af94513524f14f5fd287d2a26ceeab/app/controllers/concerns/signature_verification.rb#L96) * [Akkoma](https://akkoma.dev/AkkomaGang/http_signatures/src/branch/main/lib/http_signatures/http_signatures.ex#L46)