Remove polling workaround

Gitbox webhooks are enabled again.
diff --git a/audit/Jenkinsfile b/audit/Jenkinsfile
index 1951848..94f8c98 100644
--- a/audit/Jenkinsfile
+++ b/audit/Jenkinsfile
@@ -22,10 +22,6 @@
         buildDiscarder logRotator(numToKeepStr: '25')
         timeout time: 1, unit: 'HOURS'
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM '@hourly'
-    }
     agent {
         label 'ubuntu'
     }
diff --git a/chainsaw/Jenkinsfile b/chainsaw/Jenkinsfile
index 0f8da19..eda1825 100644
--- a/chainsaw/Jenkinsfile
+++ b/chainsaw/Jenkinsfile
@@ -24,10 +24,6 @@
         buildDiscarder logRotator(numToKeepStr: '25')
         timeout time: 1, unit: 'HOURS'
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM '@hourly'
-    }
     agent {
         label 'ubuntu'
     }
diff --git a/kotlin/Jenkinsfile b/kotlin/Jenkinsfile
index 1951848..94f8c98 100644
--- a/kotlin/Jenkinsfile
+++ b/kotlin/Jenkinsfile
@@ -22,10 +22,6 @@
         buildDiscarder logRotator(numToKeepStr: '25')
         timeout time: 1, unit: 'HOURS'
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM '@hourly'
-    }
     agent {
         label 'ubuntu'
     }
diff --git a/log4j/Jenkinsfile b/log4j/Jenkinsfile
index 40d6c41..65cd554 100644
--- a/log4j/Jenkinsfile
+++ b/log4j/Jenkinsfile
@@ -33,10 +33,6 @@
         // fail parallel stages as soon as any of them fail
         parallelsAlwaysFailFast()
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM 'H/5 * * * *'
-    }
     // https://jenkins.io/doc/book/pipeline/syntax/#agent
     agent {
         // https://cwiki.apache.org/confluence/display/INFRA/Jenkins+node+labels
diff --git a/parent/Jenkinsfile b/parent/Jenkinsfile
index 4770a50..385ce10 100644
--- a/parent/Jenkinsfile
+++ b/parent/Jenkinsfile
@@ -24,10 +24,6 @@
         buildDiscarder logRotator(numToKeepStr: '10')
         timeout time: 5, unit: 'MINUTES'
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM '@hourly'
-    }
     agent {
         label 'ubuntu'
     }
diff --git a/scala/Jenkinsfile b/scala/Jenkinsfile
index eb29d20..1000609 100644
--- a/scala/Jenkinsfile
+++ b/scala/Jenkinsfile
@@ -22,10 +22,6 @@
         buildDiscarder logRotator(numToKeepStr: '25')
         timeout time: 1, unit: 'HOURS'
     }
-    triggers {
-        // TODO: this can be removed once gitbox webhooks are re-enabled
-        pollSCM '@hourly'
-    }
     agent {
         label 'ubuntu'
     }