Dinghy Slack Notifications not working - java.lang.NoSuchMethodError- void org.jsoup

Issue

Customers may find that after upgrading to 2.27.x cannot get Slack Notifications even though it was working previously.  This can occur, for example, after setting up Slack notifications in Dinghy Upon investigating Echo logs, customers may see the following error in Echo: org.springframework.web.util.NestedServletException: Handler dispatch failed; nested exception is java.lang.NoSuchMethodError: 'void org.jsoup.select.NodeTraversor.(org.jsoup.select.NodeVisitor)' with a further reference to: Caused by: java.lang.NoSuchMethodError: 'void org.jsoup.select.NodeTraversor.(org.jsoup.select.NodeVisitor)'

Cause

The issue was caused by recent upgrades to the jinjava package in Spinnaker, which caused an issue with a dependency in jsoup.