Bump Gerrit and module to v3.5.6

Change-Id: Iac1dd5317adf78ced733d838a21779eedac6b0c3

pom.xml

diff --git a/pom.xml b/pom.xml
index af54b41..9b22b88 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 
     <groupId>com.gerritforge</groupId>
     <artifactId>global-refdb</artifactId>
-    <version>3.5.4.4</version>
+    <version>3.5.6</version>
     <packaging>jar</packaging>
 
     <name>global-refdb</name>
@@ -38,7 +38,7 @@
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <gerrit.version>3.5.4</gerrit.version>
+        <gerrit.version>3.5.6</gerrit.version>
     </properties>
 
     <dependencies>