Fix typo in incoming tag groovy pipeline 2/2

Refs. swh/infra/sysadm-environment#4766

jobs/templates/dependency-incoming-tag.groovy.j2

@@ -3,7 +3,7 @@ pipeline {
   stages {
     stage('Refresh tag list') {
       agent any
-      steps
+      steps {
         updateGitlabCommitStatus name: 'jenkins', state: 'running'
         checkout([
           $class: 'GitSCM',
@@ -20,6 +20,7 @@ pipeline {
           ],
           extensions: [[$class: 'CloneOption', honorRefspec: true]],
         ])
+      }
     }
     stage('Build Debian package') {
       when {