Fix update for remove method on repository

packages/net/__tests__/repository.test.ts

@@ -303,7 +303,7 @@ describe("Repository", () => {
 
       expect(updateHandler).toHaveBeenLastCalledWith({
         added: [],
-        removed: [event.id],
+        removed: new Set([event.id]),
       })
     })
   })

packages/net/src/repository.ts

@@ -144,7 +144,7 @@ export class Repository extends Emitter {
       this._updateIndex(this.eventsByAuthor, event.pubkey, undefined, event)
       this._updateIndex(this.eventsByKind, event.kind, undefined, event)
 
-      this.emit("update", {added: [], removed: [event.id]})
+      this.emit("update", {added: [], removed: new Set([event.id])})
     }
   }