Update Safari data for api.Notification.silent (#20664)

This PR updates and corrects version values for Safari (Desktop and iOS/iPadOS) for the `silent` member of the `Notification` API. The data comes from the [mdn-bcd-collector](https://mdn-bcd-collector.gooborg.com) project (v10.2.3).

_Check out the [collector's guide on how to review this PR](https://github.com/GooborgStudios/mdn-bcd-collector#reviewing-bcd-changes)._

Tests Used: https://mdn-bcd-collector.gooborg.com/tests/api/Notification/silent

api/Notification.json

@@ -1011,7 +1011,7 @@
             "opera": "mirror",
             "opera_android": "mirror",
             "safari": {
-              "version_added": "17"
+              "version_added": "16.6"
             },
             "safari_ios": "mirror",
             "samsunginternet_android": "mirror",