[TEST] Increase processing delay in LDAP tests (#33410)

SearchGroupsResolverInMemoryTests was (rarely) fail in a way that
suggests that the server-side delay (100ms) was not enough to trigger
the client-side timeout (5ms).

The server side delay has been increased to try and overcome this.

Resolves: #32913

x-pack/plugin/security/src/test/java/org/elasticsearch/xpack/security/authc/ldap/SearchGroupsResolverInMemoryTests.java

@@ -46,10 +46,10 @@ public void closeConnection() {
      * than simply returning no results.
      */
     public void testSearchTimeoutIsFailure() throws Exception {
-        ldapServers[0].setProcessingDelayMillis(100);
+        ldapServers[0].setProcessingDelayMillis(500);
 
         final LDAPConnectionOptions options = new LDAPConnectionOptions();
-        options.setConnectTimeoutMillis(500);
+        options.setConnectTimeoutMillis(1500);
         options.setResponseTimeoutMillis(5);
         connect(options);