Retry RDE report on SocketTimeoutException

It's likely that either 1) we should be doing this for more than a
SocketTimeoutException - we probably want to do this in the case of a number
of different transient failures 2) we don't want to do this at all because it
happens in a background task that will get re-run anyway.

In any case, this seems like the right fix and it addresses a problem we see
occassionally.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=139935190

java/google/registry/util/Retrier.java

@@ -93,8 +93,8 @@ public class Retrier implements Serializable {
   @SafeVarargs
   public final <V> V callWithRetry(
       Callable<V> callable,
-      Class<? extends RuntimeException> retryableError,
-      Class<? extends RuntimeException>... moreRetryableErrors) {
+      Class<? extends Throwable> retryableError,
+      Class<? extends Throwable>... moreRetryableErrors) {
     final Set<Class<?>> retryables =
         new ImmutableSet.Builder<Class<?>>().add(retryableError).add(moreRetryableErrors).build();
     return callWithRetry(callable, new Predicate<Throwable>() {