Update uat-cloud.jenkinsfile

jenkinsfile/uat-cloud.jenkinsfile

@@ -34,7 +34,7 @@ pipeline {
         stage("Build"){
             steps{
                 timeout(time:5, unit:"MINUTES"){
-                   mavenHome = tool 'maven-3.5.2'
+                   mavenHome = tool "maven-3.5.2"
                    sh "${mavenHome}/bin/mvn clean -U install  -Dmaven.test.skip=true"
                 }
             }