Make h3::Event::Reset log visible on userdebug builds

This log indicates that DnsResolver just received a RESET_STREAM
from DoH server. The error code in RESET_STREAM could be important
for debugging.

Bug: 264966204
Test: mm
Change-Id: I1377af535e4366aa65cc0c595b81b2542f224998
diff --git a/doh/connection/driver.rs b/doh/connection/driver.rs
index 315fc13..8251bd3 100644
--- a/doh/connection/driver.rs
+++ b/doh/connection/driver.rs
@@ -445,7 +445,7 @@
                 self.respond(stream_id)
             }
             h3::Event::Reset(e) => {
-                debug!(
+                warn!(
                     "process_h3_event: h3::Event::Reset with error code {} on stream ID {}, network {}",
                     e, stream_id, self.driver.net_id
                 );