Note : com.google.android.permission.AD_ID permission has been added in most of Ad Network sdks, (Like Applovin, Unity, Admob)
Seen on :
Unity Sdk : 4.3.0
Applovin Sdk : 11.4.4
Admob : 21.1,0
It doesnt require any action on your part,
Also, its just a notice you can ignore it