DnsResolver: bump min sdk 29(Q) to 30(R)

Mainline push to Q was stopped in February 2023.

Test: TreeHugger
Bug: 283996141
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Ice919b4bb6719f373a496d3cc1ae5f1b65b559bd