await store.finish() in voice memo test.

(cherry picked from commit 4c98b432b30693b306993c33c11de921803d06ab)

Author: mbrandonw

Examples/VoiceMemos/VoiceMemosTests/VoiceMemosTests.swift

@@ -294,6 +294,7 @@ final class VoiceMemosTests: XCTestCase {
     await store.send(.voiceMemo(id: url, action: .delete)) {
       $0.voiceMemos = []
     }
+    await store.finish()
   }
 }