Up version of logback.

Change-Id: I14ee22662b9a24a9e49ce1da50f0800b8a4aa6ca

Author: tomas-langer

pom.xml

@@ -1886,7 +1886,7 @@
         <jstl.version>1.2</jstl.version>
         <jta.api.version>1.2</jta.api.version>
         <kryo.version>4.0.1</kryo.version>
-        <logback.version>1.1.3</logback.version>
+        <logback.version>1.2.3</logback.version>
         <mimepull.version>1.9.6</mimepull.version>
         <mockito.version>1.10.19</mockito.version>
         <moxy.version>2.6.4</moxy.version>