Fix assignees field in patchSchema

We are returning `assignees` in patches as `Author` since March 2024, so
we should also parse patches with the correct zod schema.

This shouldn't break any up to date `radicle-httpd`

http-client/lib/repo/patch.ts

@@ -92,7 +92,7 @@ export const patchSchema = object({
   target: string(),
   labels: array(string()),
   merges: array(mergeSchema),
-  assignees: array(string()),
+  assignees: array(authorSchema),
   revisions: array(revisionSchema),
 });