[Code Health] Fix misc-const-correctness build warning am: 50746ee1 am: 2606af27

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/2509035



Change-Id: Iafed3436f7291796e1ffb6929c5c80d39b68bf49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>