JVMCBC-1343 Reduce HTTP idle timeout from 4.5 seconds to 1 second

Motivation
----------
Previous default of 4.5 seconds was too close to the
server-side default of 5 seconds. This could cause
spurious request failures.

Change-Id: Ic46e076e728d7aa514a88acb6e6a16e6a4da62b6
Reviewed-on: https://review.couchbase.org/c/couchbase-jvm-clients/+/194090
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Michael Reiche <michael.reiche@couchbase.com>

core-io/src/main/java/com/couchbase/client/core/service/AbstractPooledEndpointServiceConfig.java

@@ -35,10 +35,10 @@ public abstract class AbstractPooledEndpointServiceConfig implements ServiceConf
   public static final int DEFAULT_MIN_ENDPOINTS = 0;
 
   /**
-   * By default, idle pooled endpoints are cleaned up every 4.5 seconds so that
+   * By default, idle pooled endpoints are cleaned up every second so that
    * they do not clash with idle socket close attempts by the server.
    */
-  public static final Duration DEFAULT_IDLE_TIME = Duration.ofMillis(4500);
+  public static final Duration DEFAULT_IDLE_TIME = Duration.ofSeconds(1);
 
   private final int minEndpoints;
   private final int maxEndpoints;