Upgrade gitlab4j to 4.12.0

Author: baymac

pom.xml

@@ -56,7 +56,7 @@
         <dependency>
             <groupId>org.gitlab4j</groupId>
             <artifactId>gitlab4j-api</artifactId>
-            <version>4.11.17</version>
+	    <version>4.12.0</version>
         </dependency>
         <dependency>
             <groupId>javax.servlet</groupId>