fix(updater): only uses DoH to cloudflare+google

- prevent dns plaintext manipulation both the periodic update and when running in cli mode
- possibly higher reliability on poor connections versus UDP
- drop `-dns` flag in update command
- for now no configuration allowed since it makes everything rather complex

internal/updater/resolver/parallel.go

@@ -11,9 +11,9 @@ type Parallel struct {
 	repeatResolver *Repeat
 }
 
-func NewParallelResolver(resolverAddress string) *Parallel {
+func NewParallelResolver(dialer Dialer) *Parallel {
 	return &Parallel{
-		repeatResolver: NewRepeat(resolverAddress),
+		repeatResolver: NewRepeat(dialer),
 	}
 }