Fix `assignees` field in `patchSchema` — radicle-explorer

We are returning assignees in patches as Author from radicle-httpd since March 2024 with commit 5329d45d72a03e5ba06e206b4ef2f2cb5f32e67a, so we should also parse patches with the correct zod schema.

This shouldn’t break any up to date radicle-httpd, this change was already in radicle-httpd before we started with versioning it.

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   target: string(),
   labels: array(string()),
   merges: array(mergeSchema),
   assignees: array(string()),
   assignees: array(authorSchema),
   revisions: array(revisionSchema),
 });