Good news is this isn't an issue but a misunderstanding as Google Play isn't trying to update GServices. Bad news, GOS can't do much to make this interaction clearer.
As documented on the website, the OS is already preventing Google Play from updating GServices so what GPlay is trying to update/install isn't GServices per se but optional modules (which usually happen if your device isn't set to english for example). It's perfectly safe and actually recommended to accept said update.
Note that the above information doesn't relate to Aurora Store. It's isn't safe to update GServices through Aurora Store and the app should be blacklisted.