gotosocial

- 'milas' on github posted https://github.com/superseriousbusiness/gotosocial/issues/894#issuecomment-1848420395,
  with a corresponding go-fed/httpsig patch that makes GtS able to check
  signatures using both query string and non-query string.
- Apply this patch (after making it actually apply cleanly and making
  necessary changes elsewhere), using a new forked go-fed/httpsig with
  that change and the puck fix in there too.
- It even seems to work!