Migrate @Provides methods to @Binds methods where possible.

@Binds is a much more efficient way to delegate one binding to another in that:
  * The @Binds method does not need to be invoked
  * It does not generate an additional Provider implementation
  * An additional Provider does does not need to be instantiated
Future changes to Dagger's component processor will add even further benefits.

More information: []

ATTENTION REVIEWERS: This migration is being done with global approval.  Per-project approval is not required.

Tested:
    TAP train for global presubmit queue
    []
-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=125980758

java/google/registry/dns/writer/dnsupdate/DnsUpdateWriterModule.java

@@ -14,6 +14,7 @@
 
 package google.registry.dns.writer.dnsupdate;
 
+import dagger.Binds;
 import dagger.Module;
 import dagger.Provides;
 
@@ -23,12 +24,10 @@ import javax.net.SocketFactory;
 
 /** Dagger module that provides a DnsUpdateWriter. */
 @Module
-public final class DnsUpdateWriterModule {
+public abstract class DnsUpdateWriterModule {
 
-  @Provides
-  static DnsWriter provideDnsWriter(DnsUpdateWriter dnsWriter) {
-    return dnsWriter;
-  }
+  @Binds
+  abstract DnsWriter provideDnsWriter(DnsUpdateWriter dnsWriter);
 
   @Provides
   static SocketFactory provideSocketFactory() {