Upgrade elasticsearch-rest-client to 7.3.2

Also update the test container to use 7.3.2 for V7_3 tests.

Change-Id: I2a32d2c5f0bd3b84c1b0e3da81407e40833d3e09
diff --git a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
index 7739125..265c61c 100644
--- a/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
+++ b/gerrit-elasticsearch/src/test/java/com/google/gerrit/elasticsearch/ElasticContainer.java
@@ -59,7 +59,7 @@
       case V7_2:
         return "blacktop/elasticsearch:7.2.1";
       case V7_3:
-        return "blacktop/elasticsearch:7.3.1";
+        return "blacktop/elasticsearch:7.3.2";
     }
     throw new IllegalStateException("No tests for version: " + version.name());
   }