Update to newest logback version

A ServerSocketReceiver related vulnerability was fixed in version 1.2.0.
Although OneLogin does not use this feature it does not hurt to update the dependency.

Author: AriPaaWun

pom.xml

@@ -14,7 +14,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<slf4jVersion>1.7.12</slf4jVersion>
 		<junitVersion>4.12</junitVersion>
-		<logbackVersion>1.1.3</logbackVersion>
+		<logbackVersion>1.2.3</logbackVersion>
 		<apacheCommonsLangVersion>3.4</apacheCommonsLangVersion>
 	</properties>