[v2] Update pinpoint-sms-voice models and endpoint tests. (aws#9687)

Author: aemous

.changes/next-release/api-change-pinpointsmsvoice-80597.json

@@ -0,0 +1,5 @@
+{
+  "type": "api-change",
+  "category": "``pinpoint-sms-voice``",
+  "description": "Update pinpoint-sms-voice client and endpoint tests to latest version."
+}