Merge "Fix warnings in preparation for Rust 1.54.0" am: a37dc7d9 am: d3735e8e am: e17eadc7 am: 7d8dd2d7

Original change: https://android-review.googlesource.com/c/platform/packages/modules/DnsResolver/+/1785132

Change-Id: Ie817ba4666954ac19483c152675d6315fc6722a6