Update deprecated_target_sdk_message text

Updated the text for apps running using a low target sdk.
Changed the language to make the message stronger and
indicate that running apps targeting a low target sdk
has an impact on privacy and security.

Bug: 237321649
Test: atest CtsPermission3TestCases:android.permission3.cts.PermissionGroupTest
Change-Id: I8d5521c26731e9b4b6e3bf28a1f180c6fd5bd783