[Code Health] Fix misc-const-correctness build warning am: 50746ee1 am: 2606af27 am: d11f6a9e

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



Change-Id: Ifae03d8d4366b0d2e7ff96f714d05ab118e4718b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>